Types of Chemical Reactions Model Question Paper

10th Standard

    Reg.No. :
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Science

Time : 02:00:00 Hrs
Total Marks : 50
    6 x 1 = 6
  1. H2(g) + Cl29(g) → 2HCl(g) is a

    (a)

    Decomposition Reaction

    (b)

    Combination Reaction

    (c)

    Single Displacement Reaction

    (d)

    Double Displacement Reaction

  2. Photolysis is a decomposition reaction caused by

    (a)

    heat

    (b)

    electricity

    (c)

    light

    (d)

    mechanical energy

  3. The reaction between carbon and oxygen is represented by C(s) + O2(g) → CO2(g) + Heat. In which of the type(s), the above reaction can be classified?
    (i) Combination Reaction
    (ii) Combustion Reaction
    (iii)Decomposition Reaction
    (iv) Irreversible Reaction

    (a)

    i and ii

    (b)

    i and iv

    (c)

    i, ii and iii

    (d)

    i, ii and iv

  4. A single displacement reaction is represented by X(s) + 2HCl(aq) → XCl2(aq) + H2(g). Which of the following(s) could be X. (i) Zn (ii) Ag (iii) Cu (iv) Mg. Choose the best pair.

    (a)

    i and ii

    (b)

    ii and iii

    (c)

    iii and iv

    (d)

    i and iv

  5. Which of the following is not an“element + element → compound” type reaction?

    (a)

    C(s) + O2(g) → CO2(g)

    (b)

    2K(s) + Br2(l) → 2KBr(s)

    (c)

    2CO(g) + O2(g) → 2CO2(g)

    (d)

    4Fe(s) + 3O2(g) → 2Fe2O3(s)

  6. Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of

    (a)

    large surface area

    (b)

    high pressure

    (c)

    high concentration

    (d)

    high temperature

  7. 5 x 1 = 5
  8. A reaction between an acid and a base is called ____________

    ()

    neutralization

  9. The equilibrium attained during the melting of ice is known as ___________.

    ()

    physical equilibrium

  10. The value of ionic product of water at 250 C is _____________.

    ()

    1.00 x 10-14

  11. The number of products formed in a synthesis reaction is _________

    ()

    one

  12. The ion formed by dissolution of H+ in water is called _______________

    ()

    Hydronium ion

  13. 5 x 1 = 5
  14. Quick lime

  15. (1)

    exothermic

  16. Marble

  17. (2)

    10

  18. Lemon juice

  19. (3)

    2

  20. Milk of magnesia

  21. (4)

    CaCO3

  22. Combustion

  23. (5)

    CaO

    6 x 2 = 12
  24. When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give thr chemical equation of this reaction

  25. Define combination reaction. Give one example for an exothermic combination reaction

  26. Differentiate reversible and irreversible reactions

  27. Define rate of reaction.

  28. What is photolysis?

  29. What is LPG?

  30. 2 x 4 = 8
  31. What are called thermolysis reactions?

  32. What is a chemical equilibrium? What are its characteristics?

  33. 1 x 7 = 7
  34. A solid compound ‘A’ decomposes on heating into ‘B’ and a gas ‘C’. On passing the gas ‘C’ through water, it becomes acidic. Identify A, B and C.

  35. 1 x 7 = 7
  36. Calculate the pH of 0.001 molar solution of HCl.

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