Yellow phosphorus on reaction with $C a (O H)_{2}$ gives:

C a (H_{2} P O_{4})_{2}

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C a (H_{2} P O_{2})_{2}

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P H_{3}

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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:
$2 P_{4} + 3 C a (O H)_{2} + 6 H_{2} O \to 3 C a (H_{2} P O_{2})_{2} + 2 P H_{3}$

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