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JEE Main 20163 April

Exam: JEE Main
Year: 2016
Date: 3 April
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2016 · 3 April · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The pair in which phosphorous atoms have a formal oxidation state...

The pair in which phosphorous atoms have a formal oxidation state of + 3 is:

Options

AOrthophosphorous and hypophospheric acids
BPyrophosphorous and pyrophosphoric acids
COrthophosphorous and pyrophosphorous acids
DPyrophosphorous and hypophosphoric acids

Correct answer

C. Orthophosphorous and pyrophosphorous acids

Step-by-step solution

Acid	Formula	Formal oxidation state of phosphorous
Pyrophosphorous acid	${H}_{4}{P}_{2}{O}_{5}$	$+ 3$
Pyrophosphoric acid	${H}_{4}{P}_{2}{O}_{7}$	$+ 5$
Orthophosphorous	${H}_{3}P{O}_{3}$	$+ 3$
Hypophosphoric acid	${H}_{4}{P}_{2}{O}_{6}$	$+ 4$

Both pyrophosphorous and orthophosphorous acid have

+ 3

formal oxidation state

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