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NaCl reacts with conc. H 2 SO 4 and K 2 Cr 2 O 7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are :

1. CrO 2 Cl 2 , Na 2 CrO 4
2. Na 2 CrO 4 , CrO 2 Cl 2
3. CrO 2 Cl 2 , Na 2 Cr 2 O 7
4. CrO 2 Cl 2 , KHSO 4

Correct answer: CrO 2 Cl 2 , Na 2 CrO 4

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