Which of the following statements is/are correct, when a mixture of $N a C l$ and $K_{2} {C r}_{2} O_{7}$ is gently warmed with concentrated $H_{2} {S O}_{4}$ ?

Deep red vapors are evolved.

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The vapors when passed into

N a O H

solution give a yellow solution of

{N a}_{2} C r O_{4}

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Chlorine gas is evolved.

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Chromyl chloride is formed.

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Solution

The correct options are
A Deep red vapors are evolved.
B The vapors when passed into $N a O H$ solution give a yellow solution of ${N a}_{2} C r O_{4}$ .
D Chromyl chloride is formed.
The following reaction takes place:
$K_{2} {C r}_{2} O_{7} + 6 H_{2} O + 4 N a C l \to 2 K H {S O}_{4} + 4 N a H {S O}_{4} + 2 C r O_{2} {C l}_{2} + 3 H_{2} O$
Red vapors are due to $C r O_{2} {C l}_{2}$ When these vapors are passed through $N a O H$ , a yellow solution of ${N a}_{2} C r O_{4}$ is produced.

Hence,option A,B and D are correct.

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Which of the following statements is/are correct, when a mixture of $N a C l$ and $K_{2} {C r}_{2} O_{7}$ is gently warmed with concentrated $H_{2} {S O}_{4}$ ?