Class 10th | Chapter 1 | Chemical Reactions And Equations | Support Material | Assignment Questions
Very Short Answer QUESTIONs (1 Marks):
Q. 1 The shiny finish of wall after white wash is because of.
a) Calcium oxide b) Calcium hydroxide
c) Calcium Carbonate d) Calcium phosphate
Q. 2 Electrolysis of water is decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a) 1:1 b) 2:1
c) 4:1 d) 1:2
Q. 3 Which the following statements about the given reaction are correct:
3Fe(s) + 4H2O (g) ===> Fe2O3 (s) + 4H2 (g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizine agent
a) (i), (ii) and (iii) b) (iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
Q. 4 In order to prevent the spoilage of potato chips, they are packed in plastic bags containing the gas
a) Cl2 b) O2
c) N2 d) H2
Q. 5 The process of respiration is -
a) an oxidation reaction which is endothermic
b) a reduction reaction which is exothermic
c) a combination reaction which is endothermic
d) an oxidation reaction which is exothermic
Ans 1 (c) 2 (b) 3 (c) 4 (c) 5 (d)
Q. 6 Give an example of double displacement reaction?
Q. 7 Name the reducing agent in given below chemical reaction
3 MnO2 + 4Al ===> 2 Mn + 2 Al2O3
Q.8 Name the brown coloured gas evolved when lead nitrate crystal are
heated in dry test-tube.
Q. 9 Give reasons
a) Silver chloride is stored in dark coloured bottles.
b) Copper vessel loses shine when exposed to air
c) Iron is places copper from copper sulphate solution.
Q. 10 Identify the following reactions as
i) combination ii) decomposition iii) displacement reactions and double displacement reaction.
i) ZnCO3 (s) → ZnO(s) + CO (g)
ii) Pb(s) + CuCl2 → PbCl2 (aq) + Cu(s)
iii) H (g) + cl2 (g) → 2HCl
iv) CaCO3 (s) → CaO (s) + CO2 (g)
v) NaCl(g) + AgNO3 (g) → AgCl + NaNO3
vi) 3H2 (g) + N2 (g) → 2NH3 (g)
vii) Fe2O3 + Al → Al2O3 +2Fe
Q. 11 - What changes do you observe in the iron nails and color of copper sulphate solution, if iron nails are dipped in CuSO4 solution for 15 minutes?
Q. 12 - Identify the chemical change:
Melting of ice or conversion of milk into curd.
Q. 13 - Why is respiration considered an exothermic reaction?
Q. 14 - Why do copper vessel lose shine when exposed to air?
Q. 15 - Potato chips manufacturers fill the packet of chips with nitrogen gas. why.
Q. 16 - Why do we store silver chloride in dark coloured bottles in labs?
Q. 17 - Write a chemical equation of double displacement reaction.
Q. 18 - N2 + 3 H2 → 2NH3, name the type of reaction.
Q. 19 - What happens when mild is left open at room temperature during summers?
Q. 20 - What happens when quick lime is added to water?
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1. Define combination reaction. Give one example of combination reaction which is exothermic in nature.
2. What is decomposition reaction ? Explain with the help of an example.
3. Name and state the law which is kept in mind when we balance a chemical
equation.
4. Give one example of each :
(a) Chemical reaction showing evolution of gas.
(b) Change in substance’s colour during a chemical reaction.
5. What is rancidity ? Write two ways by which it can be prevented.
6. What are two conditions which promotes corrosion ?
7. A small amount of ferrous sulphate is heated in hard glass tube.
(a) Write the chemical equation.
(b) What type of reaction is taking place.
8. What happens when Zn strip is dipped in CuSO4 solution ?
a) Calcium oxide b) Calcium hydroxide
c) Calcium Carbonate d) Calcium phosphate
Q. 2 Electrolysis of water is decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a) 1:1 b) 2:1
c) 4:1 d) 1:2
Q. 3 Which the following statements about the given reaction are correct:
3Fe(s) + 4H2O (g) ===> Fe2O3 (s) + 4H2 (g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizine agent
a) (i), (ii) and (iii) b) (iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
Q. 4 In order to prevent the spoilage of potato chips, they are packed in plastic bags containing the gas
a) Cl2 b) O2
c) N2 d) H2
Q. 5 The process of respiration is -
a) an oxidation reaction which is endothermic
b) a reduction reaction which is exothermic
c) a combination reaction which is endothermic
d) an oxidation reaction which is exothermic
Ans 1 (c) 2 (b) 3 (c) 4 (c) 5 (d)
Q. 6 Give an example of double displacement reaction?
Q. 7 Name the reducing agent in given below chemical reaction
3 MnO2 + 4Al ===> 2 Mn + 2 Al2O3
Q.8 Name the brown coloured gas evolved when lead nitrate crystal are
heated in dry test-tube.
Q. 9 Give reasons
a) Silver chloride is stored in dark coloured bottles.
b) Copper vessel loses shine when exposed to air
c) Iron is places copper from copper sulphate solution.
Q. 10 Identify the following reactions as
i) combination ii) decomposition iii) displacement reactions and double displacement reaction.
i) ZnCO3 (s) → ZnO(s) + CO (g)
ii) Pb(s) + CuCl2 → PbCl2 (aq) + Cu(s)
iii) H (g) + cl2 (g) → 2HCl
iv) CaCO3 (s) → CaO (s) + CO2 (g)
v) NaCl(g) + AgNO3 (g) → AgCl + NaNO3
vi) 3H2 (g) + N2 (g) → 2NH3 (g)
vii) Fe2O3 + Al → Al2O3 +2Fe
Q. 11 - What changes do you observe in the iron nails and color of copper sulphate solution, if iron nails are dipped in CuSO4 solution for 15 minutes?
Q. 12 - Identify the chemical change:
Melting of ice or conversion of milk into curd.
Q. 13 - Why is respiration considered an exothermic reaction?
Q. 14 - Why do copper vessel lose shine when exposed to air?
Q. 15 - Potato chips manufacturers fill the packet of chips with nitrogen gas. why.
Q. 16 - Why do we store silver chloride in dark coloured bottles in labs?
Q. 17 - Write a chemical equation of double displacement reaction.
Q. 18 - N2 + 3 H2 → 2NH3, name the type of reaction.
Q. 19 - What happens when mild is left open at room temperature during summers?
Q. 20 - What happens when quick lime is added to water?
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Short Answer QUESTIONs (2 Marks):
1. Define combination reaction. Give one example of combination reaction which is exothermic in nature.
2. What is decomposition reaction ? Explain with the help of an example.
3. Name and state the law which is kept in mind when we balance a chemical
equation.
4. Give one example of each :
(a) Chemical reaction showing evolution of gas.
(b) Change in substance’s colour during a chemical reaction.
5. What is rancidity ? Write two ways by which it can be prevented.
6. What are two conditions which promotes corrosion ?
7. A small amount of ferrous sulphate is heated in hard glass tube.
(a) Write the chemical equation.
(b) What type of reaction is taking place.
8. What happens when Zn strip is dipped in CuSO4 solution ?
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1. What is redox reaction ? Write down a chemical reaction representing it.
2. In electrolysis of water :
(a) Name the gas collected at cathode and anode.
(b) Why is volume of one gas collected at one electrode is double of another ?
(c) Why are few drops of dil. H2SO4 added to water ?
3. In the reaction
CuO (s) + H2 (g) → Cu(s) + H2O (g)
(a) Name the oxidized substance.
(b) Name the reduced substance.
(c) Name the oxidizing agent.
4. Give reasons :
(a) White silver chloride turns grey in sunlight.
(b) Brown coloured copper powder on heating in air turns into black
coloured substance.
5. Compound ‘X’ decomposes to form compound ‘Y’ and CO2 gas. Compound Y is used in manufacturing of cement.
(a) Name the compounds ‘X’ and ‘Y’.
(b) Write the chemical equation for this reaction.
6. A metal salt MX when exposed to light splits upto to form metal M and gas
X2. Metal M is used to make ornaments whereas gas X2 is used in making
bleaching powder. The salt MX is used in black & white photography.
(a) Identify the metal M and gas X2.
(b) Identify MX.
(c) Write down the chemical reaction when salt MX is exposed to sunlight.
7. A metal strip X is dipped in blue coloured salt solution YSO4. After some time a layer of metal ‘Y’ is formed on metal strip X. Metal X is used in galvanization
whereas metal Y is used for making electric wires.
(a) What could be metal ‘X’ and ‘Y’ ?
(b) Name the metal salt YSO4.
(c) What type of chemical reaction takes place between X and YSO4 ? Write the
balanced chemical equation.
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Short Answer QUESTIONs (3 Marks):
1. What is redox reaction ? Write down a chemical reaction representing it.
2. In electrolysis of water :
(a) Name the gas collected at cathode and anode.
(b) Why is volume of one gas collected at one electrode is double of another ?
(c) Why are few drops of dil. H2SO4 added to water ?
3. In the reaction
CuO (s) + H2 (g) → Cu(s) + H2O (g)
(a) Name the oxidized substance.
(b) Name the reduced substance.
(c) Name the oxidizing agent.
4. Give reasons :
(a) White silver chloride turns grey in sunlight.
(b) Brown coloured copper powder on heating in air turns into black
coloured substance.
5. Compound ‘X’ decomposes to form compound ‘Y’ and CO2 gas. Compound Y is used in manufacturing of cement.
(a) Name the compounds ‘X’ and ‘Y’.
(b) Write the chemical equation for this reaction.
6. A metal salt MX when exposed to light splits upto to form metal M and gas
X2. Metal M is used to make ornaments whereas gas X2 is used in making
bleaching powder. The salt MX is used in black & white photography.
(a) Identify the metal M and gas X2.
(b) Identify MX.
(c) Write down the chemical reaction when salt MX is exposed to sunlight.
7. A metal strip X is dipped in blue coloured salt solution YSO4. After some time a layer of metal ‘Y’ is formed on metal strip X. Metal X is used in galvanization
whereas metal Y is used for making electric wires.
(a) What could be metal ‘X’ and ‘Y’ ?
(b) Name the metal salt YSO4.
(c) What type of chemical reaction takes place between X and YSO4 ? Write the
balanced chemical equation.
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LONG ANSWER TYPE QUESTIONS (5 Marks)
Q.1- White wash was being done at Mukesh's house. Mukesh saw that the painter added quick lime to drum having water. Mukesh touched outer surface of drum, it is unbelievably hot.
(a) Write the chemical equation for above reaction.
(a) Write the chemical equation for above reaction.
(b) What type of reaction is it?
(c) What is utility of this reaction?
Q.2- Write down the balanced chemical equation for the following:
(a) Silver chloride is decomposed in presence of sunlight to give silver and chlorine gas.
(b) Calcium oxide reacts with water to give lime water.
(c) Sodium hydroxide reacts with hydrochloric acid to give sodium chloride and water
(d) Dil. hydrochloric acid is added to copper oxide to give green colored copper chloride and water.
(e) Solution of barium chloride and sodium sulphate in water reacts to give insoluble Barium sulphate and solution of Sodium chloride.
(c) What is utility of this reaction?
Q.2- Write down the balanced chemical equation for the following:
(a) Silver chloride is decomposed in presence of sunlight to give silver and chlorine gas.
(b) Calcium oxide reacts with water to give lime water.
(c) Sodium hydroxide reacts with hydrochloric acid to give sodium chloride and water
(d) Dil. hydrochloric acid is added to copper oxide to give green colored copper chloride and water.
(e) Solution of barium chloride and sodium sulphate in water reacts to give insoluble Barium sulphate and solution of Sodium chloride.
Practice Based MCQs:
1. When aqueous solution of sodium sulphate and barium chloride are mixed together, it becomesa)
a) turns red b) forms a white precipitate
c) forms yellow precipitate d) becomes colourless
2. The colour of ferrous sulphate crystal is
a)yellow b) light green
c) red d) brown
3. A student took solid quick lime in a china dish and added a small amount of water to it. He would hear
a) pop sound b) a crackling sound
c) hissing sound d) no sound at all
4. When an iron nail is placed in copper sulphate solution the observation are as follow
a) The solution turns light green b) A brown deposit is formed on the nail
c) Born ‘a’ and ‘b’ d) None of the above
Answer - 1. (b) 2. (b) 3. (c) 4. (c)
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