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NEET levelSingle correct optionDifficulty 1 of 3bn004

What is the oxidation number of phosphorus in phosphoric acid, $H X_{3} PO X_{4}$ (H is $+ 1$ , O is $- 2$ )?

A $+ 5$
B $+ 4$
C $+ 3$
D $+ 6$

Answer: A

The molecule is neutral, so the oxidation numbers add to zero:

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

, so

x = + 5

.

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