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In the following reaction 4P + 3KOH + 3H2O → 3KH2PO2 + PH3

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In the following reaction

4P + 3KOH + 3H2O → 3KH2PO2 + PH3

(a) phosphorus is both oxidised and reduced.

(b) only phosphorus is reduced.

(c) phosphorus is not oxidised

(d) None of these

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Correct answer: (a) phosphorus is both oxidised and reduced.

Explanation:

4P + 3KOH + 3H2O → 3KH2PO2 + PH3

O.N of P = 0, In KH2PO2 it is + 1,

In PH3 it is -3.

Hence P is oxidised and reduced.

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