[1999]
(a) $+3$
(b) $+1$
(c) $+4$
(d) $+5$
Correct Answer: 22.(d)
Solution:
Let oxidation state of phosphorus is $x$ $(4 \times 1+(-2) \times 7+2 x)=0$
$\therefore 2 x=10$ or $x=+5$
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