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JEE Main levelSingle correct optionDifficulty 2 of 3pn097

The oxidation state of phosphorus in hypophosphoric acid, $H X_{4} P X_{2} O X_{6}$ , (which contains a P-P bond) is

A+4
B+5
C+3
D+2

Answer: A

Let P be x:

4 (+ 1) + 2 x + 6 (- 2) = 0

, so

2 x = 8

and

x = + 4

(the P-P bond contributes zero).

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