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
5. Observe the following equations and identify the correct statement with respect to these equations : (Preparatory -3)
(A) Copper is more reactive than iron and silver
(B) Iron is more 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
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)
3. What is rancidity? (Preparatory -3)
TWO MARKS QUESTIONS
1. Analyse the activity depicted in the figure given below. In this activity, when ferrous sulphate crystals are heated does the colour and crystalline nature of it remain same or not ? Support your answer with reason. (Preparatory -1)
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)
7. Translate the following word equations into chemical equations : (Preparatory – 3)
i) Carbon + Oxygen → Carbon dioxide
ii) Zinc carbonate → Zinc oxide + Carbon dioxide
iii) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
OR
Chemical reactions are to be balanced. Why ? Which are the observations that help us to determine that chemical reaction has taken place ?
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.
4. Write the chemical formula of baking soda.(Preparatory – 3)
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)
7. a) By using distilled water and concentrated acid, how do you decrease the concentration of the acid ? Explain. (Preparatory – 3)
b) Doctors suggest to take milk of magnesia at the time of indigestion. Why ?
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
6. A compound that reacts with an acid and a base to produce salt and water is (Preparatory – 3)
(A) Aluminium oxide
(B) Copper oxide
(C) Iron oxide
(D) Sodium oxide
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)
7. How is pure mercury obtained from cinnabar? (Preparatory – 3)
OR
Why fire does not catch up when calcium reacts with water ?
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?
7. Draw the diagram of the arrangement of the apparatus used to show the action of steam on metal. Label the following parts. (Preparatory -3)
i) Delivery tube ii) Metal sample.
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
6. Compound that forms by the reaction between carboxylic acid and alcohol is (Preparatory – 3)
(A) an aldehyde
(B) a ketone
(C) a haloalkane
(D) an ester
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 ?
5. a) Carbon atoms neither form 4 − C anion nor form 4 + C cation. Explain.
b) Write the structural formula of ‘Butyne’ and ‘Cyclohexane’.
OR
a) Explain the cleansing action of soap.
b) Write the differences between saturated and unsaturated carbon compounds.
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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