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Oxidation reaction involves loss of elec...

Oxidation reaction involves loss of electrons, and reduction reaction involves gain of electrons. The reaction in which a species disproportinates into two oxidation states ( lower and higher) is called disproportionation reaction.
Which of the following statements is wrong?

A

An acidified `K_(2)Cr_(2)O_(7)` paper on being exposed to `SO_(2)` turns green.

B

Mercuric chloride and stannous chloride cannot exist as such.

C

Iron turning on addition to `CuSO_(4)` solution decolourises the blue colour.

D

`[CuI_(4)]^(2-)` is formed but `[CuCl_(4)]^(2-)` is not.

Text Solution

Verified by Experts

The correct Answer is:
D
a. `Cr_(2)O_(7)^(2-)` (orange red) oxidises `SO_(2)` to `SO_(4)^(2-)` and is itself reduced to `Cr^(+3)` (green).
`underset(("Orange"))(Cr_(2)O_(7)^(2-)+3H^(o+)+3SO_(2))rarrunderset(("Green"))(2Cr^(3+)+3SO_(4)^(2-)+4H_(2)O`
b. Both reacts together
`overset(+2)(Hg)Cl_(2)+overset(+2)(SnCl_(2))rarroverset(+1)underset(("White ppt"))(HgCl_(2))darr+overset(+4)(SnCl_(4))`
`overset(+1)(Hg_(2))Cl_(2)+overset(+2)(SnCl_(2))rarrunderset((Grey))(2Hg)darr+overset(+4)(SnCl_(4))`
c. `overset(0)Fe+underset((Blue))overset(+22)(CuSO_(4))rarrFe^(2+)+overset(0)(Cu)`
d. `[CuCl_(4)]^(2-)` is formed but `[CuI_(4)]^(2-)` is not.
`I^(ө)`ion reduces `Cu^(2+)` to `overset(+1)(Cul)` and itself undergoes oxidation to form `I_(2)`. However, `CI^(ө)` does not reduce `Cu^(2+)`.
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Knowledge Check

  • Oxidation reaction involves loss of electrons, and reduction reaction involves gain of electrons. The reaction in which a species disproportinates into two oxidation states ( lower and higher) is called disproportionation reaction. Which of the following statements is correct?

    A
    An element in the lowest oxidation state acts only as a reducing agent.
    B
    An element in the highest oxidation state acts only as a reducing agent.
    C
    The oxidation number of `V` is `Rb_(4)K(HV_(10)O_(28)) is +4`.
    D
    The oxidation number and valency of `Hg` in calomel is `+1`

  • A reduction reaction involves

    A
    addition of oxygen
    B
    addition of nitrogen
    C
    addition of hydrogen
    D
    None of the above

  • Oxidation reaction involves loss of electrons, and reduction reaction involves gain of electrons. The reaction in which a species disproportinates into two oxidation states ( lower and higher) is called disproportionation reaction. Which of the following is not a dispropotional reaction?

    A
    `overset(ө)OH+Br_(2)rarrBr^(ө)+BrO_(3)^(ө)`
    B
    `Cu_(2)O+2H^(o+)rarrCu+Cu^(2+)+H_(2)O`
    C
    `(CN)^(ө)rarrCO_(3)^(2-)+NO_(3)^(ө)`
    D
    `(CN)_(2)+2overset(ө)OHrarrCN^(ө)+CNO^(ө)+H_(2)O`

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