Which of the following statements is-are correct when a mixture of N aCl and K 2 Cr 2 O 7 are gently warmed with conc- H 2 SO 4 -A- A deep red vapour is evolvedB- The vapour when passed into N aOH solution gives a yellow solution of N a 2 CrO 4C- Chlorine gas is evolvedD- Chromyl chloride is formed

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Potassium Permanganate

Which of the ...

Question

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. $H_{2} S O_{4}$ ?

A deep red vapour is evolved

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The vapour when passed into $N a O H$ 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 options are
A
A deep red vapour is evolved

B
The vapour when passed into $N a O H$ solution gives a yellow solution of $N a_{2} C r O_{4}$

C
Chlorine gas is evolved

D
Chromyl chloride is formed

When a mixture of $N a C l$ is heated with $K_{2} C r_{2} O_{7}$ in concentrated $H_{2} S O_{4}$ , red vapour of chromyl chloride $(C r O_{2} C l_{2})$ is produced. Vapours of chromyl chloride when passed through $N a O H$ solution turns yellow due to the formation of $N a_{2} C r O_{4}$ . Some chlorine gas is also evolved owing to the following side reaction:
$6 C l^{-} + C r_{2} O_{7}^{2 -} + 14 H^{+} \to 3 C l_{2} (g) ↑ + 2 C r^{3 +} + 7 H_{2} O$

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Which of the following statement(s) is/are correct when a mixture of NaCl and K2Cr2O7 are gently warmed with conc. H2SO4 ?

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. $H_{2} S O_{4}$ ?