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Standard XII
Chemistry
Question

Phosphine is not evloved when :
  1. White phosphorus is boiled with a strong
    solution of
    Ba (OH)2
  2. Phosphorus acid is heated
  3. Calcium hypophosphite is heated
  4. Metaphosphoric acid is heated

A
Calcium hypophosphite is heated
B
White phosphorus is boiled with a strong
solution of
Ba (OH)2
C
Metaphosphoric acid is heated
D
Phosphorus acid is heated
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Solution
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In A, B, C - PH3 is evolved.

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