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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus

JEE Advanced levelSingle correct optionDifficulty 3 of 3pn050

Let $x$ be the total number of P-OH groups and $y$ the total number of $P = O$ bonds in one molecule each of $H X_{3} PO X_{2}$ , $H X_{3} PO X_{3}$ , $H X_{3} PO X_{4}$ and $H X_{4} P X_{2} O X_{7}$ . The value of $x + y$ is

A13
B12
C15
D10

Answer: C

P-OH groups:

H X_{3} PO X_{2}

1,

H X_{3} PO X_{3}

2,

H X_{3} PO X_{4}

3,

H X_{4} P X_{2} O X_{7}

4, so

x = 10

.

P = O

bonds: 1, 1, 1 and 2 (one on each P in the pyrophosphoric acid), so

y = 5

. Hence

x + y = 15

.

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