Assertion :Oxidation number of chromium in $C r O_{5}$ is $+ 6$ . Reason: Oxidation number of each oxygen atom in $C r O_{5}$ is $- 2$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Option C is correct.
Oxidation number of $C r O_{5}$
$x + 4 (- 1) - 2$
$x = 6$
Therefore, oxidation number of $C r O_{5}$ is 6 i.e. assertion is correct but oxidation number of each oxygen atom in $C r O_{5}$ is not $- 2$ . In $C r O_{5}$ peroxide linked oxygen atom remains in $- 1$ state and double bond oxygen in $- 2$ state i.e reason is incorrect.

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