Which of the following statement is correct when a mixture of NaCl and K 2 C r 2 O 7 is gently warmed with conc. H 2 S O 4 ? 1 . a deep red vapour is evolved 2 . The vapour when passed into NaOH solut

Question

Which of the following statement is correct when a mixture of NaCl and $K_{2} C r_{2} O_{7}$ is gently warmed with conc. $H_{2} S O_{4}$ ?

$1$ . a deep red vapour is evolved

$2 .$ The vapour when passed into NaOH solution gives a yellow solution of $N a_{2} Cr O_{4}$

$3 .$ chlorine gas is evolved

$4 .$ chromyl chloride is formed

TestHub · Accepted Answer

4NaCl + K 2 C r 2 O 7 + 6 H 2 S O 4 conc . → 2KHS O 4 + 4NaHS O 4 + 2Cr O 2 C l 2 orange red Chromyl chloride + 3 H 2 O Chromyl chloride vapours when passed through NaOH solution gives a yellow solution of N a 2 Cr O 4 . Cr O 2 C l 2 + 4NaOH → N a 2 Cr O 4 + 2NaCl + 2 H 2 O

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