$K_{2} C r_{2} O_{7}$ on heating with aqueous $N a O H$ , gives:

C r O_{4}^{2 -}

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C r (O H)_{3}

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C r_{2} O_{7}^{2 -}

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C r (O H)_{2}

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Solution

The correct option is A $C r O_{4}^{2 -}$
The chromates and dichromates are interconvertible in aqueous solution depending upon pH of the solution. The oxidation state of chromium in chromate and dichromate is the same.
$K_{2} C r_{2} O_{7} + 2 N a O H \to K_{2} C r O_{4} + N a_{2} C r O_{4} + H_{2} O$

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