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Yellow phosphorous on reaction with $Ca(OH)_2$ gives

$\begin{array}{1 1}(a)\;Ca(H_2PO_4)_2&(b)\;Ca(H_2PO_2)_2\\(c)\;PH_3&(d)\;both\;(b)\;and\;(c)\end{array}$

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A)
$8P+3Ca(OH)_2+6H_2O\rightarrow 3Ca(H_2PO_2)_2+2PH_3$
Hence Yellow phosphorous on reaction with $Ca(OH)_2$ gives $Ca(H_2PO_2)_2,PH_3$
Hence (d) is the correct answer.
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