KSEEB MODEL QUESTION PAPER 1,2,3,4, Pre Exam - 1, 2 - 2025-26 CHAPTERWISE - PHYSICS

    PHYSICS    

   ELECTRICITY   

    MULTIPLE CHOICE QUESTIONS

1. The S I unit of potential difference is (MQP –1)

(A) volt (V)             (B) ampere (A) 

(C) coulomb (C)    (D) ohm meter (Ωm)

2. The S I unit of electric current is (MQP –2)

(A) ampere (A)    (B) ohm (Ω) 

(C) volt (V)           (D) watt (W)

3. The rate of energy consumed in an electrical circuit is, electric (MQP –3)

(A) current 

(B) potential difference 

(C) resistance 

(D) power

4. When three resistors of different resistance are connected in parallel in an electric circuit and switched on, then the quantity that remains the same in all the resistors is (MQP –4)

(A) current 

(B) potential difference 

(C) resistance 

(D) resistivity

5. The SI unit of potential difference (preparatory – 1)

(A) volt             (B) Ampere 

(C) coulomb    (D) ohm metre

6. The SI unit of resistivity is (preparatory – 2)

(A) ohm-metre     (B) coulomb 

C) volt                    (D) joule

     ONE MARK QUESTIONS

1. Write the symbols of the following components used in the electric circuit. (MQP –1)

(i) Dry cell  (ii)Rheostat

2. Draw the symbols of the following components used in an electrical circuit. (MQP –3)

i) Rheostat ii) Wires crossing without joining

3. Write the diagrams of the symbols of the following components used in an electric circuit:

i) Rheostat or variable resistance (preparatory – 1)

ii) Wire crossing without joining.

4. Mention the role of fuse in the domestic circuit. (preparatory – 2)

     TWO MARKS QUESTIONS

1. Mention the factors on which resistance of a conductor depend. (MQP –1)

2. Draw a simple electric circuit. Label ammeter and voltmeter (MQP –2)

3. An electric motor receives 10A electric current from 220V electric source. Find the power of

Motor (MQP –2)

4. How does the resistance of a conductor related to the length of the conductor and the area of cross-section of that conductor? (MQP –3)

OR

The resistivity of some materials found at 20o C is given in the table below. Look at it and answer the questions given below

a) Which is the better conductor among silver and copper? Why?

b) Alloys are used in electric heating devices. Why?

5. Among nichrome and copper wires, which of the wires is used in electric fan and in the coils of electric heater? Why? (MQP –4)

6. Observe the given diagram and calculate the total resistance in the given electric circuit.(Preparatory – 1)

7. If the total resistance in the given circuit is 4Ω then find the resistance of the resistor X.(Preparatory – 2)

     FOUR MARKS QUESTIONS

1. a) Observe the below table. Which of the below listed electrical appliances consumes more energy?  (MQP –1)

b) 2 Ω and 4 Ω resistors are connected in parallel. If 6 Ω resistor is used in place of 4 Ω, then find the difference between the difference between the total resistance obtained in both of these arrangements.

OR

a) A 350W bread toaster is used 6 hours a day. A 250W iron box is used 4 hours a day. If these appliances are used for 30 days, then calculate the total cost of the energy consumption at the rate of Rs. 4 for 1kWh.

b) A fan having the power 880W is connected to a source of potential difference 220V in an electric circuit. Calculate the electric current and the electric resistance of this circuit.

2. a) State Joule’s law of heating and name four appliances which work on the heating effect of electricity.

b) Give reason. (MQP –2)

(i) The tungsten is used almost exclusively for filament of electric lamps.

(ii) Copper and aluminium wires are usually employed for electricity transmission.

OR

a) State ohm’s law. List the factors on which the resistance of conductor depends.

b) “The potential difference between two points is 1V.” Mention the meaning of this statement.

3. a) Observe the diagram of below given electric circuit. Find the total resistance and the total current of the circuit. (MQP –3)

b) An electric fan rated 50 W is used for 6 hours in a day. What is the cost of the energy it consumes for 30 days at Rs.4 per 1kWh?

4. a) Two resistors of resistance 10Ω and 40Ω are connected in series and connected to a 12V battery. Calculate the equivalent resistance in the electric circuit and the total current flowing in the circuit.

b) A washing machine rated 500W is used for 2 hours a day for 30 days. Calculate the cost of using this appliance at 3 Rs per 1 kWh. (MQP –4)

OR

a) Resistance of a metal wire of length 2 m is 28 Ω at 20°C. If the diameter of the wire is 0.04 mm then, what will be the resistivity of the metal at that temperature?

b) 1000 J of heat is produced each 2 seconds in a 5Ω resistor. Find the potential difference across the resistor.

5. a) List the factors on which the resistance of a conductor depends. (Preparatory – 1)

b) Write the mathematical form of Joule’s law of heating. Name any two devices that work on the basis of Joule’s law of heating.

6. a) State Ohm's law. List the factors on which the resistance of the conductor depends. (Preparatory – 2)

b) "The potential difference between two points of a conducting wire is 1 V." Write the meaning of this statement.

   MAGNETEIC EFFECTS OF ELECTRIC CURRENT

    MULTIPLE CHOICE QUESTIONS

1. Observe the figure given below. The magnetic field at the centre ‘C’ of circular coil is (MQP –2)

(A) zero   (B) I    (C) 2I1    (D) 2I2

2. Correct statement with respect to magnetic field in the given diagram is, (Preparatory – 1)

(C → Current-carrying solenoid, P and Q → Points inside the solenoid,R→ Point outside the solenoid)

The magnetic field

(A) in P is more than in Q

(B) in Q is more than in P

(C) in R is more than in P and in O

(D) in P and in Q is equal.

     ONE MARK QUESTIONS

1. Observe the below figure. When switch is closed, does the B end of the solenoid attract the N end of the bar magnet? Clarify the answer (MQP –1)

2. List any two suggestions to avoid the overload in domestic electric circuit. (MQP –2)

3. What happens if the fuse is connected to the neutral wire instead of connecting to the live wire in the meter board of the house? (MQP –3)

4. What are the reasons for overload in an electric circuit?

5. Two situations of freely suspended parallel copper wires carrying current are shown in the figure given below. (MQP –4)

In which of these situations, the wires attract each other? Justify your answer

6. What does the thumb indicate in the right-hand thumb rule? (Preparatory – 2)

     TWO MARKS QUESTIONS

1. What precautionary measures have to be taken to avoid overload in domestic circuit? (MQP –1)

2. One end of the bar magnet is brought near the south pole of a magnetic needle. Then this end of the magnetic needle deflects away from the end of the bar magnet. Name the pole of the bar magnet that has been directed towards the south pole of this magnetic needle. Give reason for your answer. (MQP –3)

3. Draw the diagram indicating the field lines of the magnetic field around a current-carrying straight conductor. (MQP –4)

4. Mention any four properties of magnetic field lines. (Preparatory – 1)

OR

What precautionary measures have to be taken to avoid overload in domestic electric circuit?

5. Write any two methods of increasing the magnetic field produced by a circular coil carrying electric current. (Preparatory – 2)

      THREE MARKS QUESTIONS

1. Explain an activity of obtaining magnetic field lines around a bar magnet using a compass needle.

OR

Explain experiment that shows ‘a current carrying conductor when kept in the magnetic field experiences a mechanical force. (MQP –1)

2. a) What is solenoid? (MQP –2)

b) State Fleming’s left hand rule.

c) What is the potential difference between live wire and neutral wire in domestic electric circuit in our country?

3. a) What are the reasons for overloading in an electric circuit? (MQP –3)

b) What is solenoid? How can electromagnet be prepared from a solenoid?

OR

a) Mention the properties of magnetic field lines.

b) When the number of turns of a current carrying circular loop is increased by ten times what change occurs in the magnetic field produced in it?

4. Explain an experiment to demonstrate that a current carrying conductor placed in a magnetic field experiences a force. (MQP –4)

OR

Explain an activity to draw the magnetic field lines around a bar magnet using a compass needle.

5. Explain the activity of drawing magnetic field lines around a bar magnet using a compass needle. (Preparatory – 1)

6. A transparent glass sheet is placed over a bar magnet. Iron filings sprinkled over the glass sheet. The glass sheet is given a gentle tap and following observations are made. (Preparatory – 2)

a) Iron filings form non-parallel curved lines.

b) Iron filings are closely packed near the poles.

c) As moved away from the bar magnet, the distribution of the iron filings become rarer. Which property of the bar magnet does each of the above observations indicate?

OR

The given diagram represents the experiment conducted to observe the deviation of a beam of electrons when the beam enters the magnetic field perpendicularly. If the beam deviates in the direction out of the surface of the paper then

i) predict the pole of the magnet indicated as A

ii) state the principle that helps this prediction.

    LIGHT – REFLECTION AND REFRACTION

     MULTIPLE CHOICE QUESTIONS

1. The reciprocal of focal length of lens is (MQP –1)

(A) the power of lens

(B) the radius of curvature of lens

(C) equal to the sum of object distance and image distance

(D) equal to the difference between the object distance and image distance

2. A mirror produces erect and enlarged image of an object. Then the type of mirror and the nature of that image is respectively (MQP –3)

(A) Convex mirror and virtual image

(B) concave mirror and real image

(C) Convex mirror and real image

(D) Concave mirror and virtual image

3. The diameter of the reflecting surface of a spherical mirror is (MQP –4)

(A) pole of the mirror 

(B) centre of curvature 

(C) principal axis 

(D) aperture

4. The distance between principal focus and the optic centre of the lens is (Preparatory - 2)

(A) Radius of curvature 

(B) Object distance 

(C) Focal length 

(D) Image distance

      ONE MARK QUESTIONS

1. Which mirror is used as rear view mirror? (MQP –2)

2. In the given diagram, which angle is bigger among the angles r1, and r2? Give a reason. (Preparatory - 1)

     THREE MARKS QUESTIONS

1. Draw a ray diagram to show the image formation when an object is kept beyond ‘C’ in front of a concave mirror. Mention the nature and position of the image formed. [C: Centre of curvature of mirror]  (MQP –1)

2. a) State two laws of reflection of light. (MQP –2)

b) What is magnification of mirror? What does the negative sign indicate in the magnification value?

OR

Explain the activity which shows the refraction of light through a glass slab.

3. Draw the diagram to show the image formation when an object is placed between 2F1 and F1 of a convex lens. Mention the position and size of the image formed. (F1 -principal focus of lens) (MQP –3) 

4. Draw the ray diagram to show the image formation when an object is kept between ‘C’ and ‘F’ of a concave mirror. Write the nature and size of the image formed. [C = Centre of curvature, F = Principal Focus] (MQP –4)

5. Draw the ray diagram for the image formation when an object is placed between 2F1 and F1 of a convex lens. Mention the nature of the image formed. [ F1 : Principal focus of the lens. ](Preparatory – 1)

6. Draw the ray diagram of the image formed when an object is placed at F1 in front of a convex lens. Mention the position and size of the image. (Preparatory – 1)

     FOUR MARKS QUESTIONS

1. a) State the laws of refraction of light. (MQP –1)

b) Mention any two differences between convex mirror and convex lens.

2. a) An object is placed perpendicular to principal axis of a convex lens of focal length 20cm. If the distance of image is to be 60cm, then at what distance the object is to be placed from the lens?

b) The object distance and image distance of a lens are -30cm and -10 cm respectively. Decide the type of lens and nature of image. (MQP –2)

3. a) What is reflection of light? (MQP –3)

b) State the laws of reflection of light.

c) What is the focal length of a mirror?

OR

a) What is refraction of light?

b) State Snell’s law of refraction.

c) Define the following with respect to a lens. i) Focal point ii) Aperture

4. a) What is magnification? Write the formula to calculate magnification of the image produced by a lens.

b) State the laws of reflection of light. (MQP –4)

5. a) What is magnification? If the magnification of an image produced by a lens is + 2, then mention the type of the lens. b) The refractive index of medium A is less than that of medium B. Which of these media is optically denser? In which of these media the speed of light is more? (Preparatory – 1)

OR

a) What is centre of curvature of a spherical mirror ? Write any two uses of concave mirror.

b) State the laws of refraction of light.

6. a) What is magnification? If the magnification of the image produced by a lens is + 2, then mention the type of the lens. b) Refractive index of medium A is lesser than the refractive index of medium B. Which of these two media is optically denser ? In which medium speed of light is more? (Preparatory – 2)

OR

a) State two laws of reflection of light.

b) Write any two differences between concave mirror and convex mirror.

    HUMAN EYE AND COLOURFUL WORLD 

     TWO MARKS QUESTIONS

1. Observe the figure given below. Name the angle of deviation and identify its value. (MQP –1)

2. Draw a diagram of experiment conducted by Newton to show the recombination of white light. (MQP –2)

3. Define the phenomenon expressed in below given figure. Which colour does H and M represent here? (MQP –3)

4. What is the colour of danger signal lights? Why is that colour preferred? (MQP –4)

5. Observe the below given diagram of the human eye. Name the eye defect indicated in this diagram and mention the lens used to correct this defect. (Preparatory – 1)

6. Observe the given diagram and answer the following questions: (Preparatory – 2)

a) What is the colour of the ray of light indicated as A ?

b) Predict the colour of the ray of light indicated as B. Justify your answer.

       THREE MARKS QUESTIONS

1. a) Mention any two symptoms of myopic eye. How can this defect be rectified? (MQP –1)

b) What is power of accommodation of eye?

2. a) What is near-sightedness? (MQP –2)

b) What is power of accommodation of eye? How does the eye accommodate to see distant objects?

OR

Stars appear to twinkle but the planets do not twinkle. Why?

3. What is presbyopia? Mention the reasons and suggest a remedy for this defect? (MQP –3)

OR

What is short-sightedness? What are the reasons for this defect? How can it be corrected?

4. a) A student clearly reads letters of a textbook only when the book is kept at a distance more than 50cm from his eyes without difficulty. Then, (MQP –4)

i) identify this defect of the eye.

ii) suggest a remedy for this defect.

b) When sunlight passes through the trees of a dense forest on a foggy morning then the path of the beam of light appears between the trees.

i) What is this phenomenon called?

ii) The same phenomenon is not normally visible in an open field. Why? Write your analysis.

OR

a) The position of the stars changes apparently in the clear sky. Why? Explain.

b) White light is passed through the given arrangement of three glass prisms (X, Y, and Z) as shown in the figure given below.

i) Is spectrum of light seen on the screen?

ii) What is the role of prism Z

5. Explain the phenomenon of formation of the rainbow in the atmosphere. (Preparatory – 1)

OR

Explain Newton’s experiment that shows the recombination of spectrum of white light.

6. What is myopia (near sightedness ) ? What are the causes for myopia ? Name the type of the lens used to correct myopia. (Preparatory – 2)

OR

a) What is the Tyndall effect ? Which property of the scattering particles decides the colour of the scattered light ?

b) What is the colour of danger signal lights ?

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KSEEB MODEL QUESTION PAPER 1,2,3,4, Pre Exam - 1, 2 - 2025-26 CHAPTERWISE - CHEMISTRY

    CHEMISTRY   

  CHEMICAL REACTIONS AND EQUATIONS  

    MULTIPLE CHOICE QUESTIONS

1. 

Analyse the experiment expressed in the above figure. The molecular formulae of the solution ‘Y’ that gives a yellow colour precipitate by reacting with KI solution and the another product that forms here respectively are. (MQP –1)

(A) Pb(NO3)2 and KNO3 

(B) PbI2 and KNO3 

(C) Pb(NO3)2 and KI 

(D) Pb(NO3)2 and K2SO4

2. Silver chloride turns grey when exposed to sunlight. This is because silver chloride (MQP –2)

(A) decomposes to form silver. 

(B) decomposes to form chlorine.

(C) combines with oxygen. 

(D) reacts with atmospheric moisture.

3. The type of chemical reaction in which reactants exchange their ions is (Preparatory – 1)

(A) Double displacement 

(B) Displacement 

(C) Decomposition 

(D) Combination

4. Silver chloride turns grey colour when exposed to the sunlight. Because, silver chloride (Preparatory -2)

(A) decomposes to form silver 

(B) splits as ions

(C) combines with oxygen 

(D) reacts with atmospheric moisture

    ONE MARK QUESTIONS

1. What is the reason for the formation of brown coloured fume in the experiment shown through the below given figure? (MQP –3)

2. What is rancidity? (MQP –4)

     THREE MARKS QUESTIONS

1. Write the balanced chemical equations for the following word equations. (MQP –1)

(i) Manganese oxide + hydrochloric acid → manganese chloride + chlorine + water

(ii) Calcium hydroxide + carbon dioxide → calcium carbonate + water

(iii)Zinc carbonate → zinc oxide + Carbon dioxide

OR

Convert the following chemical reactions into chemical equations.

(i) Ammonia forms when nitrogen gas reacts with hydrogen gas.

(ii) Sodium oxide reacts with water to form sodium hydroxide.

(iii) By reacting with water potassium metal produces potassium hydroxide and hydrogen gas.

2. Balance the following equations (MQP –2)

(i) Mg + N2 → Mg3N2

(ii) NaOH + H2SO4 → Na2SO4 + H2O

(iii) Al(OH)3 → Al2O3 + H2O

OR

Convert the following chemical reactions into chemical equations.

(i) Copper reacts with concentrated nitric acid.

(ii) Silver nitrate solution is added to potassium bromide solution.

(iii) Zinc oxide is reduced by coke.

3. a) Magnesium ribbon burns with a dazzling white flame in the air and changes into magnesium oxide. Mention the type of this reactions. (MQP –3)

b) List out the observations that help us to determine that a chemical reaction has been taken place.

OR

a) Chemical equations have to be balanced. Why?

b) Mention the measures that are followed to prevent rusting of iron.

4. write the balanced chemical equations for the following reactions. (MQP –4)

a) Calcium carbonate → Calcium oxide + carbon dioxide

b) Hydrogen + chlorine → Hydrogen chloride

c) Magnesium + hydrochloric acid → Magnesium chloride + Hydrogen

5. Balance the following chemical equations: (Preparatory – 1)

i) AgC l → Ag + Cl2

ii) Fe + H2O → Fe3O4+H2

iii) N2 + H2 → NH3

OR

i) What are redox reactions?

ii) CuO + H2 → Cu + H2O. Identify the substance oxidised and the substance reduced in this equation.

iii) What is the difference between endothermic and exothermic reactions?

6. What is rancidity ? Write any two methods of preventing rancidity. (Preparatory – 2)

   ACIDS, BASES AND SALTS  

     MULTIPLE CHOICE QUESTIONS

1. The chemical formula of bleaching powder is (MQP –3)

(A) NaCl         (B) Na2CO3 

(C) CaCO3    (D) CaOCl2

2. As the pH value of a neutral solution increase, (MQP –4)

(A) basic property decreases and number of OH− ions increases.

(B) acidic property increases and number of H+ ions decreases.

(C) basic property increases and number of OH− ions increases.

(D) acidic property decreases and number of H+ ions increases.

3. When CO2 gas is passed through a clear solution of X, this solution milky. When CO2 supply is continued, this milky solution turns clear solution due to the formation of salt Y. In this reaction X and Y is. (Preparatory – 2)

(A) Calcium carbonate and calcium hydroxide

(B) Calcium hydrogen carbonate and calcium chloride

(C) Calcium hydroxide and calcium hydrogen carbonate

(D) Calcium carbonate and calcium hydrogen carbonate

    ONE MARK QUESTIONS

1. How do you detect a base using blue litmus paper? (MQP –1)

2. Hydrochloric acid is considered as a strong acid. Why? (MQP –2)

3. The pH values of four solutions are given in the following table. In these (Preparatory – 1)

a) Which solution has more concentration of H+ ions?

b) Name the neutral solution.

     TWO MARKS QUESTIONS

1. Draw the diagram of the arrangement of apparatus used to show the reaction of zinc granules with dilute sulphuric acid and label the hydrogen gas bubbles. (MQP –1)

2. When concentrated sulphuric acid is added to a test tube containing solid sodium chloride the gas ‘X’ will be released. What are the ions formed when this gas is passed into water? What are the products formed when the gas ‘X’ is passed into an aqueous basic solution obtained in the chlor-alkali process? (MQP –2)

3. A solution of baking soda is commonly applied to the area of a honeybee stung area. Justify this action. (MQP –3)

4. Analyze the list of experiments in the table given below. In which of the experiments the following salts will be produced? (MQP –4)

i) An acidic salt

ii) A neutral salt

5. Draw the diagram of the arrangement of apparatus used to show the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning. (Preparatory – 1)

6. Under a very high humid climate, sodium chloride with sulphuric acid produces a dry gas. Now which dry litmus paper changes its colour when brought in contact with this gas ? Why ? (Preparatory – 2)

OR

A solution of baking soda is commonly applied to the honey bee stung area. Justify this action.

     THREE MARKS QUESTIONS

1. Four solutions A, B, C and D when tested with universal indicator showed pH as 5, 2, 7 and 11 respectively. Which solution (MQP –1)

(i) has more hydronium ions? 

(ii) is neutral? 

(iii) is the weak acid?

2. a) What is acid rain? (MQP –2)

b) Which gas is liberated when an acid reacts with a metal carbonate?

c) Write the chemical name and molecular formula of baking soda.

3. Draw the diagram to show the reaction of the zinc granules with dilute sulphuric acid and testing hydrogen gas by burning. Label the following parts. (MQP –3)

i) Zinc granules ii) Delivery tube

4. a) What is neutralization? (MQP –4)

b) Name the acid present in the following substances.

i) Curd ii) Gastric juice

5. a) What is acid rain? (Preparatory – 1)

b) Which gas liberates when an acid reacts with a metal carbonate?

c) Write the chemical name and molecular formula of baking soda.

6. Draw the diagram of the apparatus to show the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning. Label the following parts. i) Delivery tube ii) Zinc granules. (Preparatory – 2)

   METALS AND NON-METALS   

     MULTIPLE CHOICE QUESTIONS

1. The constituent metals in brass are (MQP –1)

(A) copper and zinc 

(B) aluminium and tin 

(C) copper and tin 

(D) zinc and aluminium

2. To make iron to be hard and strong (MQP –2)

(A) carbon is added to pure iron 

(B) zinc is added to pure iron

(C) fused with some other metals 

(D) anodization will be done

3. CuSO4 + Fe → FeSO4 + Cu (MQP –3)

2AgNO3 + Cu → Cu(NO3)2 +2Ag

A) Copper is more reactive than iron and silver

B) Iron is less reactive than copper and silver

C) Copper is more reactive than silver but less reactive than iron

D) Silver is more reactive than copper and iron.

4. To make pure iron hard and strong, the substance that is to be added to it is (MQP –4)

(A) carbon       (B) zinc 

(C) nickel        (D) tin

5. A + Salt solution of B → Salt solution of A + B. A and B in this word equation are metals. These metals respectively are (Preparatory – 2)

(A) copper and sodium 

(B) lead and aluminium

(C) combines with oxygen 

(D) magnesium and zinc

     ONE MARK QUESTIONS

1. What are the applications of the thermite reaction? (MQP –1)

2. What is roasting in metallurgy? (MQP –2)

3. Name any two metals that are available in the pure form in the nature. (MQP –3)

4. Aluminium articles do not corrode easily like iron articles. Justify. (MQP –4)

5. Magnesium and Manganese metals are reacted with a strong oxidising acid. With which of these metals is the evolution of gas bubbles faster? (Preparatory – 1)

6. What is amalgum? (Preparatory – 2)

    TWO MARKS QUESTIONS

1. Draw the diagram to the arrangement of the apparatus used in the electrolytic refining

of copper and label cathode. (MQP –1)

2. Write the properties of ionic compounds with respect to solubility, melting point, physical state and electrical conductivity. (MQP –2)

OR

Give reasons.

(i) Magnesium metal displaces copper in copper sulphate solution.

(ii) Sodium metal is stored in kerosene.

3. How is pure mercury obtained from cinnabar? (MQP –3)

OR

Why the calcium does not catches fire when it reacts with water?

4. Draw the diagram to show the action of steam on metals. (MQP –4)

5. Draw the diagram of the arrangement of the apparatus used to show the action of steam on metal. (Preparatory – 1)

6. Draw the diagram to show the arrangement of the apparatus used in the electrolytic refining of copper. (Preparatory – 2)

    THREE MARKS QUESTIONS

1. a) Explain the formation of sodium chloride molecule by the transfer of electrons.

b) What are the products obtained when aluminium metal reacts with steam? (MQP –1)

OR

a) Explain the formation of magnesium chloride molecule by the transfer of electrons.

b) How is pure zinc obtained from zinc oxide?

2. Draw the diagram of the arrangement of apparatus used to show the action of steam on a metal. Label the following parts. (MQP –2)

(i) Glass-wool soaked in water (ii) Delivery tube

3. a) Show the formation of magnesium chloride molecule by transfer of electrons. (MQP –3)

b) Aluminium oxide is called an amphoteric oxide. Why?

4. Explain the formation of ionic bond between sodium and chlorine atoms. (MQP –4)

OR

a) Write the chemical reactions to prove that aluminium oxide is an amphoteric oxide.

b) How calcination differs from roasting?

5. Explain the formation of sodium chloride molecule by the transfer of electrons. (Preparatory -1)

OR

a) Aluminium oxide is called an amphoteric oxide. Why?

b) How calcination process differs from roasting?

6. Explain the formation of magnesium chloride molecule by the transfer of electrons. (Preparatory -2)

OR

a) Write any two differences between roasting and calcination.

b) Sodium metal is stored in kerosene. Why?

    CARBON AND IT'S COMPOUNDS

     MULTIPLE CHOICE QUESTIONS

1. A property of carbon that is responsible for giving rise large molecules is (MQP –1)

(A) tetravalency 

(B) catenation 

(C) inflammability 

(D) allotropism

2. The functional group present in pentanal is (MQP –2)

(A) - OH            (B) - CHO 

(C) - COOH      (D) - CO -

3. Another structure with the same molecular formula of the compound in the following structural Formulas

4. The ′𝒙′ in the following reaction represents, (MQP –4)

(A) K2Cr2O7     (B) KMnO4 

(C) NaOH         (D) KOH

5. The property of carbon that is responsible for producing large molecules is (Preparatory – 1)

(A) Tetravalency      (B) Catenation 

(C) inflammability   (D) Allotropism

    ONE MARK QUESTIONS

1. Write the structural formula of an unsaturated carbon compound containing four carbon atoms and a ketone functional group. (MQP –1)

2. The first member of a group of carbon compounds is CH3Cl. Write the molecular formula and the name of the third member of this group. (MQP –2)

3. What is the significance of hydrogenation? (MQP –3)

4. Write the structural formula of the compound obtained when one atom of hydrogen in ‘ethane’ is replaced by −CHO group. (MQP –4)

5. What is the importance of hydrogenation of carbon compounds? (Preparatory – 1)

6. Name the simplest hydrocarbon. (Preparatory – 2)

7. Correct the following incorrect electron dot structure of an unsaturated hydrocarbon and rewrite, (Preparatory – 2)

    TWO MARKS QUESTIONS

1. a) Name the salts responsible for the hardness of water? (MQP –1)

b) Write the name and the molecular formula of the simplest hydrocarbon.

2. Explain the cleansing action of soap on dirt. (MQP –2)

OR

Carbon atoms do not form C 4 + cation ions or C 4 - anions. Why?

3. Carbon compounds are found in the larger number in the nature. Why? Clarify the reasons. (MQP –3)

4. Name the catalyst used and the product obtained in the hydrogenation of ethene. (MQP –4)

OR

The molecular formula of the first member of a homologous series of carbon compounds is CH2O(HCHO). Determine the name and the molecular formula of the third member of this group. Mention the general name of this group

5. Give reasons : (Preparatory – 1)

i) Covalent compounds have low melting points and boiling points.

ii) Carbon does not form either C4 − or C4 + ions.

6. Complete the given equation and name this chemical reaction. Write one use of this reaction. (Preparatory – 2)

     FOUR MARKS QUESTIONS

1. a) How many single bonds and double bonds are there in the molecule of C3H7COOH? (MQP –2)

b) Write the structural formulae of cyclopentane and propanol.

c) Name the substance that do not undergo a chemical change that is used in the reaction of converting a compound containing a carbon-carbon double bond into a compound containing only single bonds. Write an example for this reaction in the form of an equation.

2. a) Write any two differences between saturated and unsaturated carbon compounds. (MQP –3)

b) Write the molecular formula and structural formula of the following carbon compounds.

i) Propanoic acid ii) Cyclohexane

3. a) Give reasons: (MQP –4)

i) Carbon atoms neither form C4 - anion nor form C4+ cation.

ii) Ethanoic acid known as glacial acetic acid.

b) Write the structural formula of the following carbon compounds:

i) Butyne ii) Cyclohexane

OR

a) Explain the mechanism of cleansing action of soaps.

b) Write the differences between saturated and unsaturated carbon compounds.

4. a) Write the structures of the two structural isomers of butane. (Preparatory – 2)

b) Name the functional group present in the following carbon compounds:

i) Propanal ii) Pentanol.

OR

a) Explain the cleansing action of soap.

b) Carbon cannot form C4- ions or C4+ ions. Why ?

      FIVE MARKS QUESTIONS

1. a) Write the structures of n-butane and isobutane. (MQP –1)

b) What is esterification? How ethene is obtained from ethanol?

OR

a) Write the dot structures of nitrogen and propyne molecules.

b) Explain the cleansing action of soap on dirt.

2. a) Write the structure of n-butane and isobutane. (Preparatory – 1)

b) What is esterification? How ethene is obtained from ethanol?

OR

a) Write the electron dot structure of nitrogen and methane molecules.

b) Explain the cleaning action of soap.

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