Assertion : $N a B O_{3} / O H^{-}$ can be used for oxidation of $C r^{3 +}$ to $C r^{6 +}$ Reason: In alkaline medium $N a B O_{3}$ produces $H_{2} O_{2}$

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As in presence of alkaline medium, $N a B O_{3}$ produces $H_{2} O_{2}$ which is further used for oxidation.
So $N a B O_{3} / O H^{-}$ can be used for oxidation of $C r^{3 +}$ to $C r^{6 +}$ .

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