Phosphine is not evloved when :

White phosphorus is boiled with a strong
solution of
Ba

(O H)_{2}

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Phosphorus acid is heated

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Calcium hypophosphite is heated

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Metaphosphoric acid is heated

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Solution

The correct option is D Metaphosphoric acid is heated
In A, B, C - $P H_{3}$ is evolved.
Metaphosphoric acid is stable. $P H_{3}$ is not evolved on heating.
B) $4 H_{3} P O_{4} \to 3 H_{3} P O_{4} + P H_{3}$
C) $\to C a_{3} P O_{4} + P H_{3}$

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Phosphine is not evloved when :

The correct option is D Metaphosphoric acid is heatedIn A, B, C - PH3 is evolved.Metaphosphoric acid is stable. PH3 is not evolved on heating.B) 4H3PO4→3H3PO4+PH3C) →Ca3PO4+PH3

The correct option is D Metaphosphoric acid is heated
In A, B, C - $P H_{3}$ is evolved.
Metaphosphoric acid is stable. $P H_{3}$ is not evolved on heating.
B) $4 H_{3} P O_{4} \to 3 H_{3} P O_{4} + P H_{3}$
C) $\to C a_{3} P O_{4} + P H_{3}$