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Stoichiometry & Redox Reaction Test - 3

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Stoichiometry & Redox Reaction Test - 3
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  • Question 1
    1 / -0

    The reduction potentials of A, B, C and D are 0.8 V, 0.79 V, 0.34 V and -2.37 V, respectively. Which element displaces all the other three elements?

    Solution

    A more negative value of reduction potential implies that the substance is a better reducing agent.
    Hence, the element with the most negative value of reduction potential can displace all other elements from their salt solutions.
    D has the most negative reduction potential among the given elements; hence, it is the strongest reducing agent and displaces all the other three elements from their salt solutions.

     

  • Question 2
    1 / -0

    HBr and HI can reduce sulphuric acid. HCl can reduce KMnO4 and HF can reduce

    Solution

    Oxidation potential of HF is the lowest among halide ions. So, HF cannot reduce any chemical oxidising agent.
    F2 is a strong oxidising agent but F- is a weak reducing agent.

     

  • Question 3
    1 / -0

    Oxygen has a positive oxidation state in

    Solution

    Oxidation state of oxygen in O2F2 is +1.
    This is because fluorine is more electronegative than oxygen.

     

  • Question 4
    1 / -0

    The oxidation number of carbon in CH2O is

    Solution

    The sum of oxidation states of all atoms in a molecule is zero.
    CH2O:
    x + (2 x 1) + (-2) = 0
    x + 2 - 2 = 0
    x = 0

     

  • Question 5
    1 / -0

    In which of the following compounds does the carbon atom have zero oxidation state?

    Solution

    In CH2Cl2, carbon is in 0 oxidation state.

     

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