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Chemical Reactions Test - 4

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Chemical Reactions Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following reactions involves neutralization as well as precipitation?

    Solution

    The reaction between slaked lime and H2SO4 involves neutralisation as well as precipitation.

     

  • Question 2
    1 / -0

    Balancing of chemical equation is done for compliance with

    Solution

    Chemical equations are balanced in order to comply with the law of conservation of mass.
    Law of conservation of mass states that atoms (matter) are not destroyed in any physical or chemical process.
    Therefore the number of atoms of each element on both the sides of the equation is always equal.

     

  • Question 3
    1 / -0

    In the given ionic reactions, which one of the ions is getting oxidized?

    Cu2+(aq) + 2e- → Cu(s)
    2Cl-(aq) → Cl2(g)+ 2e-

    Solution

    Cu+2 is getting reduced by gaining electrons and the oxidation number decreases from + 2 to 0.
    Cl-1 is getting oxidised by losing electrons and the oxidation number increases from - 1 to 0.

     

  • Question 4
    1 / -0

    Which of the following is the best reducing agent?

    Solution

    I- is the best reducing agent because of its larger size; it loses its electron and gets oxidised to I2 and acts as a reducing agent.

     

  • Question 5
    1 / -0

    Which of the following is not a redox reaction?

    Solution

    CaO + 2HCl → CaCl2 + H2O is a not a redox reaction because none of the elements is undergoing a change in its oxidation state.

     

  • Question 6
    1 / -0

    In the reaction: Zn + H2SO4 → ZnSO4 + H2, zinc undergoes

    Solution

    In the reaction: Zn + H2SO4 → ZnSO4 + H2, zinc undergoes oxidation because its oxidation state increases from 0 to +2.

     

  • Question 7
    1 / -0

    The oxidation number of sulphur in SO42– is

    Solution

    The oxidation number of sulphur in SO42-
    = x + (- 8) = - 2
    x = - 2 + 8
    x = 6

     

  • Question 8
    1 / -0

    In the formula of aluminium sulphate, what does the subscript '3' indicate?

    Solution

    In the formula of aluminium sulphate, i.e. Al2(SO4)3, subscript '3' indicates the number of sulphate ions present in one formula unit of the compound.

     

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