Types of Chemical Reactions English Medium Free Online Test 1 Mark Questions 2020-2021

10th Standard

    Reg.No. :
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Science

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  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. 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

  4. The reaction between hydrogen and oxygen gas to form water is __________________

    (a)

    combination

    (b)

    redox

    (c)

    exothermic

    (d)

    all of these

  5. Which among the following chemical reaction is an example of combination reaction?
    (i) H2(g)+ CI2(g) ⟶ 2HCI(g)
    (ii) AnOH(aq) + HCl(aq) ⟶ NaCl(aq) + H2O(1)
    (iii)2Mg(S)+ O2(g) ⟶ 2MgO(S)
    (iv) Zn(S)+ 2HCI(aq) ⟶ ZnCl2 + H2(g)

    (a)

    only (i)

    (b)

    both (i) and (iii)

    (c)

    only (iii)

    (d)

    both (i) and (ii)

  6. Formation of ammonia from nitrogen and hydrogen is an example of __________ reaction.

    (a)

    Thermal decomposition

    (b)

    Combination

    (c)

    Precipitation

    (d)

    Displacement

  7. Pick out the metal that displaces hydrogen from hydrochloric acid.

    (a)

    Zinc

    (b)

    Silver

    (c)

    Copper

    (d)

    Gold

  8. Pb(NO3)2 + 2KI ⟶ Pbl2 + 2KNO3 is a ______________ reaction

    (a)

    neutralization

    (b)

    Precipitation

    (c)

    decomposition

    (d)

    Combustion

  9. The value of ionic product of water at 25°C is ____________

    (a)

    1.00 x 1014

    (b)

    1.00 x 10-14

    (c)

    1.00 X 104

    (d)

    1.00 X 10-4

  10. Chemically rust is

    (a)

    hydrated ferrous oxide

    (b)

    Ferrous oxide

    (c)

    hydrated ferric oxide

    (d)

    Ferric oxide

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