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……..

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

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

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?

5. In the reaction PbO + C → Pb + CO.

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

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

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

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

10. The formula of Lead Nitrate is

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

12. The formula of lead chloride is

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

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

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

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

17. What is formula of slaked lime?

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

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

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

21. The formula of calcium hydroxide is

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

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

24. The process of oxidation involves

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

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

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

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)

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

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

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?

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.

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

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

35. Which of the following does not involves

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

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

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

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

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

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

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

43. The removal of oxygen from a substance is called

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

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

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

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

48. The process of respiration is

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

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

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