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Question

P4+3NaOH+3H2O3Na(H2PO2)+PH3 is an example of a reaction.

A
disproportionation
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B
pyrolytic
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C
neutralisation
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Solution

The correct option is A disproportionation
0P4+3NaOH+3H2O3Na(H2+1PO2)+3PH3

Clearly, this is a disproportionation reaction. On the left hand side, elemental phosphorus has oxidation state 0. In PH3 oxidation state of phosphorus is -3. In sodium hypophosphite, the oxidation state of phosphorus is +1.

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