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MPSC Rajyaseva 2022 Prelims General Studies Official Paper I

Question : 20 of 100

Marks: +1, -0

O_{7}^{−4}

is _______.

Solution:

Concept:

The oxidation state is found by making the sum of oxidation numbers equal the overall charge of the ion.

Explanation:

Let the oxidation state of

\mathrm{V}

x

Oxygen has oxidation state

-2

For

\mathrm{V}_2\mathrm{O}_7^{-4}

2x + 7(-2) = -4

2x - 14 = -4

2x = 10

x = +5

Answer:

The oxidation state of

\mathrm{V}

\mathrm{V}_2\mathrm{O}_7^{-4}

+5

Correct option: A.

+5

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