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Q.

When a mixture of NaCl, $K_{2} C r_{2} O_{7}$ and conc. $H_{2} S O_{4}$ is heated in a dry test tube, a red vapor (X) is evolved. This vapor (X) turns an aqueous solution of NaOH yellow due to the formation of Y. X and Y, respectively, are:

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a

$C r C l_{3}$ and $N a_{2} C r_{2} O_{7}$

b

$C r O_{2} C l_{2}$ and $N a_{2} C r O_{4}$

c

$C r C l_{3}$ and $N a_{2} C r O_{4}$

d

$C r O_{2} C l_{2}$ and $N a_{2} C r_{2} O_{7}$

answer is C.

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Chromyl chloride test

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