The Aaryan Global School, Rohtak A Co-educational
CHEMICAL REACTION & EQUATION - ASSIGNMENT
Class 10 - Science
Time Allowed: 1 hour Maximum Marks: 50
Section A
1. Which of the following is an example of endothermic process? [1]
a) Decomposition of vegetable matter into b) Formation of slaked lime
compost
c) Dissolution of ammonium chloride in water d) Digestion of food in our body
2. Identify the balanced chemical equation. [1]
a) 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4 b) 3BaCl2 + 2Al2(SO4)3 → 2AlCl3 + 3BaSO4
c) BaCl2 + 2Al2(SO4)3 → 2AlCl3 + 3BaSO4 d) BaCl2 + Al2(SO4)3 → AlCl3 + BaSO4
3. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow [1]
precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the
following can be used in place of lead nitrate?
a) Lead acetate b) Ammonium nitrate
c) Potassium sulphate d) Lead sulphate (insoluble)
4. Which of the following metals do not corrode in moist air? [1]
a) Silver b) Copper
c) Iron d) Gold
5. An iron nail is placed in a solution of copper sulphate. The nail is taken out after 15 minutes. The nail will be [1]
found to be covered with:
a) brown deposit b) blue deposit
c) green deposit d) grey deposit
heat
6. 2FeSO4 −−→ Fe2O3 + SO2 + SO3 [1]
The above reaction is
a) Displacement reaction b) Combination reaction
c) Double displacement reaction d) Decomposition reaction
7. When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. [1]
The chemical equation for the reaction involved is:
a) KI + PbNO3 → PbI + KNO3 b) 2KI + Pb(NO3)2 → PbI2 + 2KNO3
c) KI + Pb(NO3)2 → PbI + KNO3 d) KI + PbNO3 → PbI2 + KNO3
8. 5 mL of sodium sulphate solution is taken in a test tube and 5 mL of barium chloride solution is taken in another [1]
test tube. When the two solutions are mixed slowly and the test tube is left undisturbed for some time, a white
1/5
precipitate is formed. Which of the following statements is correct about the above reaction?
a) It is a double displacement reaction since b) It is a displacement reaction since chloride
exchange of ions occurs between the two ions are replaced by sulphate ions.
reactants.
c) It is a combination reaction since barium d) It is a neutralisation reaction since an acid
ions combine with sulphate ions to give reacts with alkali to give a salt.
barium sulphate.
9. What type of reaction is an exothermic reaction? [1]
a) Decomposition reaction b) Combustion reaction
c) Redox reaction d) Displacement reactions
10. What happens when silver chloride is put under sunlight? [1]
a) Only hydrogen gas is formed. b) Silver metal and chlorine gas are formed.
c) Only silver metal is formed. d) Silver metal and hydrogen gas are formed.
11. In which of the following, the identity of initial substance remains unchanged? [1]
a) Formation of crystals by process of b) Curdling of milk
crystallisation
c) Digestion of food d) Fermentation of grapes
12. To balance the following chemical equation the values of x and y should respectively be: [1]
2NaOH + xAl2O3 → yNaAlO2 + H2O
a) 2, 4 b) 1, 2
c) 1, 4 d) 2, 3
13. Which of the following are exothermic processes? [1]
i. Reaction of water with quick lime
ii. Dilution of an acid
iii. Evaporation of water
iv. Sublimation of camphor (crystals)
a) (i) and (ii) b) (iii) and (iv)
c) (i) and (iv) d) (ii) and (iii)
14. Silver articles on exposure become black. It is an example of [1]
a) Displacemet reaction b) Reduction reaction
c) Redox reaction d) Oxidation reaction
15. Fe + CuSO4 → FeSO4 + Cu [1]
The reaction is
a) Precipitation reaction b) Displacement reaction
c) Double displacement reaction d) Combination reaction
16. The colour of the solid product formed on heating ferrous sulphate is [1]
2/5
a) Colourless b) Green
c) Black d) Reddish-brown
17. The balanced chemical equation showing reaction between quicklime and water is: [1]
a) 2 CaO + 3 H2O → 2 Ca(OH)3 + O2 + Heat b) 2 CaO + H2O → 2 CaOH + H2 + Heat
c) CaO + H2O → Ca(OH)2 + Heat d) CaO + H2O → Ca(OH)2 + H2 + Heat
18. The colour of the ferrous sulphate solution is [1]
a) Pale green b) Reddish-brown
c) Colourless d) Blue
19. When calcium oxide reacts with water, it forms a product named [1]
a) Quick lime b) Ammonia
c) Lime stone d) Slaked lime
20. The formula of product formed on heating of ferrous sulphate is [1]
a) Fe2O3 b) FeO
c) FeCO3 d) Fe2(SO4)3
Section B
21. Assertion (A): Paint is applied on the iron articles. [1]
Reason (R): To protect them from rain.
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
22. Assertion (A): Reaction of Quicklime with water is an exothermic reaction. [1]
Reason (R): Quicklime reacts vigorously with water releasing a large amount of heat.
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
23. Assertion (A): Corrosion of iron is commonly known as rusting. [1]
Reason (R): Corrosion of iron occurs in presence of moist air.
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
24. Assertion (A): In the reaction, Zn (s)
+
+ 2H
(aq)
→ Zn
2+
(aq)
+ H2(g) , zinc acts as an oxidising agent and H+ acts as [1]
a reducing agent.
Reason (R): An oxidising agent accepts electrons while a reducing agent loses electrons.
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
3/5
25. Assertion (A): Gold and silver do not corrode in moist air. [1]
Reason (R): It is because they have low reactivity.
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Section C
26. Is the Sublimation of solid ammonium chloride physical or chemical changes? [1]
27. a. Write the essential conditions for following reaction to take place and name its types: [1]
2AgCl → 2Ag + Cl2
b. Complete the following chemical reaction in the form of a balanced equation:
Δ
FeSO4 −
→ Fe2 O3 + … … . + … …
28. Balance the chemical equation: [1]
BaCl2 + H2SO4 → BaSO4 + HCl
29. Is the Dissolution of sodium hydroxide in water exothermic or endothermic in nature? [1]
30. Identify the reducing agent in the reaction: [1]
2H2 + O2 ⟶ 2H2O
31. What is rancidity? Mention any two ways by which rancidity can be prevented. [2]
32. Study the reactions given below: [2]
Which of the following chemical reactions will occur. Give suitable reason for each.
i. Zn(s) + CuSO4(aq) ⟶ ZnSO4(aq) + Cu(s)
ii. Fe(s) + ZnSO4(aq) ⟶ FeSO4(aq) + Zn(s)
iii. Zn(s) + FeSO4 (aq) ⟶ ZnSO4(aq) + Fe(s)
33. What is a balanced chemical equation? Why should chemical equations be balanced? [2]
34. A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' and the [2]
black coloured compound formed.
35. Explain why sodium acts as an oxidizing agent while chlorine acts as a reducing agent in the reaction, [2]
2Na + Cl2 → 2NaCl.
36. You are provided with two containers made up of copper and aluminum. You are also provide with solutions of [2]
dilute HCI, dilute HNO3, ZnCI2 and H2O. In Which of the above containers these solutions can be kept?
37. a. Identify the reducing agent in the following reactions: [2]
i. 4NH3 + 5O2 → 4NO + 6H2O
ii. H2O + F2 → HF + HOF
iii. Fe2O3 + 3CO → 2Fe + 3CO2
iv. 2H2 + O2 → 2H2O
b. Define a redox reaction in terms of gain or loss of oxygen.
38. What is the difference between combination and decomposition reactions? Write an equation of each type. [2]
39. i. Why is electrolysis of brine called Chlor-alkali process? Write the chemical equation involved in this [2]
process.
ii. A few crystals of hydrated copper sulphate are heated in a dry test-tube. Enlist any two observations.
4/5
40. What is the difference between rusting and burning? [2]
5/5
