Phosphine is not evolved when (a) white phosphorus is boiled with a...

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Phosphine is not evolved when
(a) white phosphorus is boiled with a strong solution of \( \mathrm{Ba}(\mathrm{OH})_{2} \)
(b) phosphorus acid is heated
(c) calcium hypophosphite is heated
(d) metaphosphoric acid is heated.
\( \mathrm{W} \)
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