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Question

Phosphine is not evloved whenΒ :

A

White phosphorus is boiled with a strong

solution of

Ba

B

Phosphorus acid is heated

C

Calcium hypophosphite is heated

D

Metaphosphoric acid is heated

Medium

Solution

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Correct option is
D

Metaphosphoric acid is heated

In A, B, C -Β  is evolved.

Metaphosphoric acid is stable. is not evolved on heating.

B)Β 

C)

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