SATHEE: Qualitative Analysis - Result Question 29

Qualitative Analysis - Result Question 29

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

(1998, 2M)

(a) A deep red vapour is evolved

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

(d) Chromyl chloride is formed

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Answer:

Correct Answer: 29. $(a, b, c, d)$

Solution:

When 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 formation of $N a_{2} C r O_{4}$ . Some chlorine gas is also evolved owing to the following side reaction :

$6 C l^{-} + C r_{2} O_{7}^{2 -} + 14 H^{+} ⟶ 3 C l_{2} (g) ↑ + 2 C r^{3 +} + 7 H_{2} O$

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Qualitative Analysis - Result Question 29

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