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Question

Yellow phosphorus on reaction with Ca(OH)2 gives:

A
Ca(H2PO4)2
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B
Ca(H2PO2)2
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C
PH3
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D
both B and C
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Solution

The correct option is D both B and C
Yellow phosphorus reacts with calcium hydroxide to form phosphine and calcium hypophosphite ion.
The reaction is:
2P4+3Ca(OH)2+6H2O3Ca(H2PO2)2+2PH3

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