What is oxidation number of $C r$ in $(N H_{3})_{3} C r O_{4}$ or $(N H_{3})_{3} C r (O_{2})_{2}$ ?

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Solution

$[C r (N H_{3})_{3} (O_{2})_{2}]$
$O_{2}^{2 -}$ Ion (peroxide)
Let oxidation state of $C r$ be $x$
$x + 3 \times 0 - 2 \times 2 = 0$
$⟹ x = + 4$

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