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

10th Standard

    Reg.No. :
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Science

Time : 01:41:00 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. Which of the following represents a precipitation reaction?

    (a)

    A(s) + B(s) → C(s) + D(s)

    (b)

    A(s) + B(aq) → C(aq) + D(l)

    (c)

    A(aq) + B(aq) → C(s) + D(aq)

    (d)

    A(aq) + B(s) → C(aq) + D(l)

  4. The product formed when calcium oxide reacts with water is

    (a)

    Slaked lime

    (b)

    Carbon dioxide

    (c)

    Calcium oxide

    (d)

    Oxygen gas

  5. An element 'A' on exposure to moist air turns to form compound 'B' which is reddish brown. Identify 'A'.and 'B'

    (a)

    'A' is Ag, 'B' is Ag2s

    (b)

    'A' is Cu, 'B' is CuO

    (c)

    'A' is Mg, 'B' is MgO

    (d)

    'A' is Fe, 'B' is Fe2O3

  6. Match the list I with list II and select the correct answer using the code given below the lists.

    List I List II
    A. Thermolysis 1. 2AgBr ⟶ 2Ag + Br
    B. Photolysis 2. HNO3 + NH4OH ⟶ NH4NO3 + H2O
    C. Electrolysis 3. 2HgO ⟶ 2Hg + O2
    D. Neutralization 4. 2NaCl ⟶ 2Na + Cl2
    (a)
      A B C D
    (a) 4 1 2 3
    (b)
      A B C D
    (b) 2 4 1 3
    (c)
      A B C D
    (c) 3 1 4 2
    (d)
      A B C D
    (d) 4 3 2 1
  7. Formation of ammonia from nitrogen and hydrogen is an example of __________ reaction.

    (a)

    Thermal decomposition

    (b)

    Combination

    (c)

    Precipitation

    (d)

    Displacement

  8. When Zinc metal is placed in hydrochloric acid, the gas evolved is _________________

    (a)

    CO

    (b)

    CO2

    (c)

    H2

    (d)

    H2O

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

    (a)

    neutralization

    (b)

    Precipitation

    (c)

    decomposition

    (d)

    Combustion

  10. 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

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