Chemical Reactions and Equations MCQs Mock Test of 10th Class Science

Welcome to your Chemical Reactions and Equations MCQs Mock Test of 10th Class Science

1. When dilute hydrochloric acid is added to iron fillings……..

(A) Hydrogen gas and ferric chloride are produced

(B) Chlorine gas and ferric hydroxide are produced

(C) No reaction takes place.

(D) Iron salt and water are produced.

2. In the reaction xPb(NO3)2 Heat yPbO + zNO2 + O2x,y and z are:

(A) 1,1,2

(B) 2,2,4

(C) 1,2,4

(D) 4,2,2

3. In the reaction FeSO4 + x → Na2S04 + Fe(OH)2, x is -

(A) Na2SO4

(B) H2SO4

(C) NaOH

(D) None of these

4. A strip of magnesium ribbon is heated over a flame for a while. It is observed that the magnesium ribbon burns with a dazzling flame and produces a substance known as magnesium oxide. Which of the following equations correctly represents the described reaction?

(A) 2Mg + O2 → 2MgO

(B) Mg + 2O → 2MgO

(C) 2Mg + O → 2MgO

(D) Mg + 0 → MgO

5. In the reaction PbO + C → Pb + CO.

(A) PbO is oxidized

(B) C acts as oxidizing agent

(C) C acts as a reducing agent

(D) This reaction does not represent a redox reaction

6. Rusting of an article made up of iron is called

(A) Corrosion and it is a physical as well as chemical change

(B) Dissolution and it is a physical change

(C) Corrosion and it is a chemical change

(D) Dissolution and it is a chemical change

7. Which statement is incorrect for the reaction CuO + H2 → Cu + H2O

(A) CuO is reduced

(B) H2 is oxidised

(C) CuO is reduced and H2 is oxidised

(D) Both CuO and H2, are oxidised

8. 2H2 + O2 → 2H2O The above reaction is an example of a

(A) Combination reaction

(B) Decomposition reaction

(C) Displacement reaction

(D) None of the above

9. The following reaction HCl(aq) + NaOH(aq) → NaCl(aq) +H20(l) is a:

(A) Redox reaction

(B) Neutralisation reaction

(C) Decomposition reaction

(D) Precipitation reaction

10. The formula of Lead Nitrate is

(A) PbNO2

(B) Pb(NO2)2

(C) PbNO3

(D) Pb(NO3)3

11. 2AgBr + 2Ag + Br2, this reaction is

(A) Decomposition

(B) Endothermic

(C) Both (A) and (B)

(D) None of the above

12. The formula of lead chloride is

(A) PbCI

(B) PbCl2

(C) PbCl3

(D) Pb2Cl

13. The chemical reaction in which heat is evolved. This reaction is a

(A) Endothermic reaction

(B) Decomposition reaction

(C) Exothermic reaction

(D) None of the above

14. Fe2O3 + 2Al → Al2O3 + 2Fe which is reduced in above reaction?

(A) Fe2O3

(B) AI

(C) Al2O3

(D) None of these

15. 2Pb(NO3)2(s) Heat 2PbO(s) + 4NO2(g) + O2(g) This reaction is

(A) Displacement

(B) Thermal decomposition

(C) Combination

(D) Exothermic

16. Which gas is used to prevent the food items from rancidity?

(A) Oxygen

(B) Hydrogen

(C) Nitrogen

(D) Chlorine

17. What is formula of slaked lime?

(A) CaO

(B) Ca(OH)2

(C) CaCO3

(D) CaSO4

18. The reaction between calcium oxide and water to form calcium hydroxide is a

(A) Decomposition reaction

(B) Displacement reaction

(C) Double displacement reaction

(D) Combination reaction

19. Limewater Ca(OH)2 turns milky when we pass a gas through it. The gas is

(A) Carbon monoxide

(B) Carbon dioxide

(C) Hydrogen sulphide

(D) Sulphur dioxide

20. The decomposition of silver chloride into silver and chlorine can be easily carried out by using

(A) Heat energy

(B) Electrical energy

(C) Light (photo) energy

(D) Chemical energy

21. The formula of calcium hydroxide is

(A) Ca(OH)2

(B) Ca(OH)3

(c) CaOH

(D) CaCO3

22. CaCO3(s) Heat CaO(s) +CO2(g), this reaction is

(A) Combination

(B) Decomposition

(C) Displacement

(D) Double displacement

23. ZnO + C + Zn + CO, this reaction is

(A) Oxidation

(B) Reduction

(C) Corrosion

(D) Redox

24. The process of oxidation involves

(A) Gain of electrons

(B) Loss of electrons

(C) Addition of hydrogen

(D) Removal of oxygen

25. Which of the following are combination reaction : (i) 2KCIO3 Heat 2KCl+3O2 (ii) MgO+H2O → Mg(OH), (iii) 4Al+302 → 2Al2O3 (iv) Zn+Feso4 → ZnSO4 + Fe

(A) Both (i) and (iii)

(B) Both (iii) and (iv)

(C) Both (ii) and (iv)

(D) Both (ii) and (iii)

26. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

(A) 2H2(l) + 02(l) → 2H2O(g)

(B) 2H2(g) + O2(l) → 2H2O(l)

(C) 2H2(g) + O2(g) 2H2O(l)

(D) 2H2(g) + O2(g) — 2H2O(g)

27. Which one of the following process involve chemical reactions?

(A) Storing of oxygen gas under pressure in a gas cylinder

(B) Liquefaction of air

(c) Keeping petrol in a China dish in the open

(D) Heating copper wire in the presence of air at high temperature

28. Which of the following are exothermic processes? 1. Reaction of water with quick lime 2. Dilution of an acid 3. Evaporation of water 4. Sublimation of camphor (crystals)

(A) 1 and 2

(B) 2 and 3

(C) 1 and 4

(D) 3 and 4

29. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

(A) Carbon dioxide or oxygen

(B) Nitrogen or oxygen

(C) Carbon dioxide or helium

(D) Helium or nitrogen

30. Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water

(A) Both (i) and (iii)

(B) Only (ii)

(C) Only (iii)

(D) Both (li) and (iv)

31. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow 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 sulphate (insoluble)

(B) Lead acetate

(C) Ammonium nitrate

(D) Potassium sulphate

32. Which among the following statement(s) is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) The formation of silver by decomposition of silver chloride. (ii) Sublimation of silver chloride. (iii) Decomposition of chlorine gas from silver chloride. (iv) Oxidation of silver chloride.

(A) Only (i)

(B) Both (ii) and (iii)

(C) Both (ii) and (ii)

(D) Only (iv)

33. Which of the following is not a physical change?

(A) Boiling of water to give water vapour

(B) Melting of ice to give water

(C) Dissolution of salt in water

(D) Combustion of Liquefied Petroleum Gas (LPG)

34. Which among the following is/are double displacement reaction(s)? (i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4+ BaCl2 → BaSO4 + 2Nacl (iii)C+O2 → CO2 (iv) CH4 + 202 → CO2 + 2H2O

(A) (i) and (iv)

(B) Only (ii)

(C) (i) and (ii)

(D) (ii) and (iv)

35. Which of the following does not involves

(A) Digestion of food in our body

(B) Process of respiration

(c) Burning of candle was when hested

(D) Melting of candle war on heating

36. You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with its solution of

(A) Potassium chloride

(b) Potassium nitride

(C) Potassium sulphide

(D) Potassium iodide

37. The chemical reaction between two substances is characterised by change in colour from orange to green. These two substances are most likely to be

(A) Potassium dichromate solution and sulphur dioxide

(B) Potassium permanganate solution and sulphur dioxide

(C) Potassium permanganate solution and lemon juice

(D) Potassium dichromate solution and carbon dioxide

38. The chemical reaction between quicklime and water is characterised by

(A) Evolution of hydrogen gas

(C) Change in temperature of mixture

(D) Change in colour of the product

39. One of the following is an endothermic reaction. This is

(A) Combination of carbon and oxygen to form carbon monoxide

(B) Combination of nitrogen and oxygen to from nitrogen monoxide

(C) Combination of glucose and oxygen to form carbon dioxide and water

(D) Combination of zinc and hydrochloric acid to form zinc chloride and hydrogen

40. Which of the following is not an endothermic reaction?

(A) CaCO3 → CaO + CO2

(B) 2H2O → 2H2 + O2

(C) 6CO2 +6H2O → C6H12O6 +6O2

(D) C6H12O6 +6O2 → 6CO2 + 6H2O

41. One of the following is an exothermic reaction. This is

(A) Electrolysis of water

(B) Conversion of limestone into quicklime

(C) Process of respiration

(D) Process of photosynthesis

42. The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is known as

(A) Law of conservation of momentum

(B) Law of conservation of mass

(C) Law of conservation of motion

(D) Law of conservation of magnetism

43. The removal of oxygen from a substance is called

(A) Oxidation

(B) Corrosion

(C) Reduction

(D) Rancidity

44. The chemical reaction involved in the corrosion of iron metal is that of

(A) Oxidation as well as displacement

(B) Reduction as well as combination

(C) Oxidation as well as combination

(D) Reduction as well as displacement

45. The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is

(A) Acidity

(B) Radioactivity

(C) Rabidity

(D) Rancidity

46. A white precipitate can be obtained by adding dilute sulphuric acid to

(A) CuSO4 solution

(B) NaCl solutionx

(B) NaCl solution

(C) BaCl2 solution (D) Na2SO4 solution

47. A white precipitate will be formed if we add common salt solution to

(A) Ba(NO3)2 solution

(B) KNO3 solution

(C) Ag(NO3)2 solution

(D) Mg(NO3)2 solution

48. 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

49. Which of the following can be decomposed by the action of light?

(A) NaCl

(B) KCl

(C) AgCl

(D) Cucl

50. Consider the reaction: KBr(aq) + AgNO3(aq) → KNO3(aq) + AgBr(s) This is an example of

(A) Decomposition reaction

(B) Combination reaction

(C) Double displacement reaction

(D) Displacement reaction