When $K_{2} C r_{2} O_{7}$ is heated with conc. $H_{2} S O_{4}$ in the presence of a soluble metal chloride, orange red vapours are produced. These are due to

C r C l_{3}

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C r O C l_{2}

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C r O_{2} C l_{2}

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C r O_{4}^{2 -}

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Solution

The correct option is C $C r O_{2} C l_{2}$
$K_{2} C r_{2} O_{7} + 4 N a C l + 6 H_{2} S O_{4} \to 2 K H S O_{4} + 4 N a H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O$

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