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Sodium Thiosulphate

What is the c...

Question

What is the change in oxidation number of chromium in the following reaction?
${Cr}_{2} O_{3} + 2 Al Δ \to {Al}_{2} O_{3} + 2 Cr$

+6 to +3

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+3 to 0

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+4 to 0

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0 to +6

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Solution

The correct option is B +3 to 0
$_{2}_{3} (s) + 2 0 Al (s) Δ \to_{2}_{3} (s) + 2 0 Cr (s)$
Change in oxidation number of chromium in the given reaction is +3 to 0.

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