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Variable Oxidation States

What is the o...

Question

What is the oxidation state of $C r$ in $[C r O_{3} (O H)]^{-}$ ?

A

3

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B

4

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C

5

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D

6

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Solution

The correct option is D 6
Let oxidation state of $C r$ be $x$
$x - (2 \times 3) - 1 = - 1$
$⟹ x = + 6$

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