Types of Chemical Reactions Book Back Questions

10th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. Photolysis is a decomposition reaction caused by

    (a)

    heat

    (b)

    electricity

    (c)

    light

    (d)

    mechanical energy

  2. 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

  3. 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)

  4. The pH of a solution is 3. Its [OH–] concentration is

    (a)

    1 × 10–3 M

    (b)

    3M

    (c)

    1 × 10–11 M

    (d)

    11 M

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

    (a)

    large surface area

    (b)

    high pressure

    (c)

    high concentration

    (d)

    high temperature

  6. 4 x 1 = 4
  7. The normal pH of human blood is _________

    ()

    7.35 - 7.45

  8. Electrolysis is type of _______________ reaction

    ()

    decomposition

  9. Chemical volcano is an example for _______________ type of reaction

    ()

    decomposition

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

    ()

    Hydronium ion

  11. 3 x 2 = 6
  12. 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

  13. Why does the reaction rate of a reaction increase on raising the temperature?

  14. Differentiate reversible and irreversible reactions

  15. 2 x 4 = 8
  16. What are called thermolysis reactions?

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

  18. 1 x 7 = 7
  19. Lemon juice has a pH 2, what is the concentration of H+ ions?

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