Which of the following statements is wrong when a mixture of $N a C l$ and $K_{2} C r_{2} O_{7}$ is gently warmed with $c o n c . H_{2} S O_{4}$ ?

A deep red vapour is evolved.

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The vapours obtained when passed through

N a O H

solution gives a yellow solution of

N a_{2} C r O_{4}

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Chlorine gas is formed.

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Chromyl chloride is formed.

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Solution

The correct option is A Chlorine gas is formed.
When potassium dichromate and sodium chloride are heated with conc. sulphuric acid, red vapours of chromyl chloride are formed.
$K_{2} C r_{2} O_{7} + 6 H_{2} S O_{4} + 4 N a C l \to 2 K H S O_{4} + 4 N a H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O$
Chromyl chloride when passed through NaOH solution gives yellow solution of sodium chromate.
$C r O_{2} C l_{2} + 4 N a O H \to N a_{2} C r O_{4} + 2 N a C l + 2 H_{2} O + 2 H_{2} O$

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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 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} .

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Which of the following statements is wrong when a mixture of NaCl and K2Cr2O7 is gently warmed with conc.H2SO4?

Which of the following statements is wrong when a mixture of $N a C l$ and $K_{2} C r_{2} O_{7}$ is gently warmed with $c o n c . H_{2} S O_{4}$ ?