Which of the following statement is correct when a mixture of $ \mathrm{NaCl} $ and $ \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} $ is gently warmed with conc. $ \mathrm{H}_{2} \mathrm{SO}_{4} $ ? 1. A deep red vapour is evolved 2. The vapour when passed into $ \mathrm{NaOH} $ solution gives a yellow solution of $ \mathrm{Na}_{2} \mathrm{CrO}_{4} $ 3. Chlorine gas is evolved 4. Chromyl chloride is formed

Question

Which of the following statement is correct when a mixture of $ \mathrm{NaCl} $ and $ \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} $ is gently warmed with conc. $ \mathrm{H}_{2} \mathrm{SO}_{4} $ ? 1. A deep red vapour is evolved 2. The vapour when passed into $ \mathrm{NaOH} $ solution gives a yellow solution of $ \mathrm{Na}_{2} \mathrm{CrO}_{4} $ 3. Chlorine gas is evolved 4. Chromyl chloride is formed, $ 1,2,4 $, $ 1,2,3 $, $ 2,3,4 $, all are correct

MARKS App · Accepted Answer

4 NaCl + K 2 Cr 2 O 7 + 6 H 2 SO 4 conc . → 2 KHSO 4 + 4 NaHSO 4 + 2 CrO 2 Cl 2 orange red Chromyl chloride + 3 H 2 O Chromyl chloride vapours when passed through NaOH solution gives a yellow solution of Na 2 CrO 4 . CrO 2 Cl 2 + 4 NaOH → Na 2 CrO 4 + 2 NaCl + 2 H 2 O

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