Which of the following statements is not correct when a mixture of $N a C l$ and $K_{2} C r_{2} O_{7}$ is gently warmed with conc. $H_{2} S O_{4} .$

A deep red vapour is evolved

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The vapour when passed in to

N a O H

solution gives 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 option is C Chlorine gas is evolved
Solution:
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 C is correct.

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Similar questions

Which of the following statement(s) is/are correct when a mixture of $N a C l$ and $K_{2} C r_{2} O_{7}$ are gently warmed with conc. $H_{2} S O_{4}$ ?

Q. Which of the following statement(s) is/are correct when a solid mixture of

K C l

and

K_{2} C r_{2} O_{7}

is gently warmed with conc.

H_{2} S O_{4}

Q. Which of the following statement(s) is (are) correct when a mixture of

N a C l

and

K_{2} C r_{2} O_{7}

is gently warmed with conc.

H_{2} S O_{4}

Q. Which of the following statement(s) is/are correct, when a mixture of

N a C l

and

K_{2} C r_{2} O_{7}

is gently warmed with conc.

H_{2} S O_{4}

Q. 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}

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Which of the following statements is not correct when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4.

The correct option is C Chlorine gas is evolvedSolution:The following reaction takes place:K2Cr2O7+6H2O+4NaCl→2KHSO4+4NaHSO4+2CrO2Cl2+3H2ORed vapors are due to CrO2Cl2When these vapors are passed through NaOH, a yellow solution of Na2CrO4 is produced.Hence, option C is correct.

Which of the following statements is not correct when a mixture of $N a C l$ and $K_{2} C r_{2} O_{7}$ is gently warmed with conc. $H_{2} S O_{4} .$