Chemical Reactions and Equations MCQ Quiz

30 questions

1. A chemical equation is balanced to satisfy the law of

   1. conservation of momentum
   2. conservation of mass
   3. constant proportions
   4. multiple proportions

2. Respiration is which type of reaction?

   1. Endothermic
   2. Exothermic
   3. Neither
   4. Precipitation

3. 2FeSO4 → Fe2O3 + SO2 + SO3 is a

   1. combination
   2. displacement
   3. decomposition
   4. double displacement

4. Digestion of food in the body is an example of

   1. combination
   2. decomposition
   3. displacement
   4. precipitation

5. When Cu is added to AgNO3 solution, the reaction is

   1. combination
   2. displacement
   3. decomposition
   4. double displacement

6. The white precipitate in AgNO3 + NaCl → AgCl + NaNO3 is

   1. NaNO3
   2. AgCl
   3. NaCl
   4. Ag

7. Burning of magnesium ribbon is a

   1. decomposition
   2. combination
   3. displacement
   4. double displacement

8. Rusting of iron is

   1. reduction
   2. oxidation
   3. neutralisation
   4. sublimation

9. In CuO + H2 → Cu + H2O, hydrogen is the

   1. oxidising agent
   2. reducing agent
   3. catalyst
   4. precipitate

10. Reaction of acid with base to give salt and water is

    1. oxidation
    2. neutralisation
    3. reduction
    4. decomposition

11. The gas evolved when zinc reacts with dilute H2SO4 is

    1. oxygen
    2. hydrogen
    3. carbon dioxide
    4. chlorine

12. Green coating on copper vessels is

    1. CuO
    2. CuCO3·Cu(OH)2
    3. CuSO4
    4. Cu(NO3)2

13. Rancidity is caused by

    1. reduction of fats
    2. oxidation of fats/oils
    3. hydrolysis of salt
    4. combination reaction

14. Which is added to food to prevent rancidity?

    1. catalysts
    2. antioxidants
    3. oxidisers
    4. bleach

15. 2H2O →(electricity) 2H2 + O2 is called

    1. electrolysis
    2. photolysis
    3. thermal decomposition
    4. corrosion

16. 2AgBr →(light) 2Ag + Br2 shows decomposition by

    1. heat
    2. electricity
    3. light
    4. pressure

17. CaO + H2O → Ca(OH)2 is

    1. endothermic combination
    2. exothermic combination
    3. decomposition
    4. displacement

18. In a redox reaction, the substance that gains oxygen is

    1. reduced
    2. oxidised
    3. unchanged
    4. a catalyst

19. Which is a double displacement reaction?

    1. Fe + CuSO4
    2. Na2SO4 + BaCl2
    3. 2H2O2 → 2H2O + O2
    4. C + O2

20. The number of atoms of oxygen in 2H2SO4 is

    1. 4
    2. 6
    3. 8
    4. 2

21. Assertion: Combination reactions are usually exothermic. Reason: Energy is released when bonds form.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

22. Colour of copper sulphate solution when an iron nail is dipped changes to

    1. blue
    2. colourless/pale green
    3. red
    4. yellow

23. Decomposition of limestone CaCO3 → CaO + CO2 requires

    1. light
    2. heat
    3. electricity
    4. catalyst

24. Which reaction produces slaked lime used in whitewashing?

    1. CaCO3 heated
    2. CaO + H2O
    3. Ca(OH)2 + CO2
    4. CaCl2 + H2O

25. The whitewash reacts with CO2 in air to form

    1. CaO
    2. CaCO3
    3. Ca(OH)2
    4. CaCl2

26. When lead nitrate is heated, the brown gas evolved is

    1. O2
    2. NO2
    3. CO2
    4. SO2

27. In 3MnO2 + 4Al → 3Mn + 2Al2O3, aluminium is

    1. oxidised
    2. reduced
    3. unchanged
    4. precipitated

28. A reaction forming an insoluble solid is a

    1. combustion
    2. precipitation
    3. neutralisation
    4. combination

29. Which balances H2 + O2 → H2O correctly?

    1. H2+O2→H2O
    2. 2H2+O2→2H2O
    3. H2+2O2→2H2O
    4. 2H2+2O2→H2O

30. Corrosion of a metal involves

    1. oxidation and combination
    2. reduction only
    3. displacement only
    4. neutralisation

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