1.

Which of the following is the example of a disproportionation reaction?A. `CaCO_(3) to CaO + CO_(2)`B. `2HCuCl_(2) to Cu + Cu^(2+) + 4Cl^(-) + 2H^(+)`C. `PCl_(5) to PCl_(3) + Cl_(2)`D. `2H_(2)S + SO_(2) to 3S + 2H_(2)O`

Answer» Correct Answer - B
(a) `underset(+2)underset(uarr)(Ca) underset(+4)underset(uarr)(C)overset(-2)overset(darr)O_(3) to underset(+2)underset(uarr)(Cu) + underset(+2)underset(uarr)(Cu^(2+)) + underset(-1)underset(uarr)(4Cl^(-)) + underset(+1)underset(uarr)(2H^(+))`
Thus, `Cu^(+)` disproportionates to Cu and `Cu^(2+)`.
(c) P is reduced and Cl is oxidised.
(d) `H_(2)S` is oxidised and `SO_(2)` is reduced.


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