JEE Main · 2023 · 31 Jan 2023 · Shift 1 · p-Block Elements

The oxidation state of phosphorus in hypophosphoric acid is + ______.

Answer: 4

Solution

Hypophosphoric acid has the formula

H X_{4} P X_{2} O X_{6}

, in which the two phosphorus atoms are joined by a direct P\textendash P bond and each phosphorus carries one doubly bonded oxygen and two hydroxyl groups. Taking the oxidation state of phosphorus as

x

, with hydrogen

+ 1

and oxygen

- 2

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

, so

2 x = 8

and

x = + 4

. The oxidation state of phosphorus in hypophosphoric acid is

+ 4

JEE Main · 2023 · 31 Jan 2023 · Shift 1 · Integer answer

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