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Question: Answered & Verified by Expert
NaCl reacts with conc. H2SO4 and K2Cr2O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;
Chemistryd and f Block ElementsJEE MainJEE Main 2024 (27 Jan Shift 1)
Options:
  • A CrO2Cl2, Na2CrO4
  • B Na2CrO4, CrO2Cl2
  • C CrO2Cl2, KHSO4
  • D CrO2Cl2, Na2Cr2O7
Solution:
1676 Upvotes Verified Answer
The correct answer is: CrO2Cl2, Na2CrO4

Chromyl chloride (B) is produced when a chloride ion reacts with conc.H2SO4 and K2Cr2O7.
Passing the chromyl chloride gas through NaOH turns the solution yellow. This is due to the formation of Na2CrO4 (C).

The reaction is as follows,

NaCl + conc. H2SO4 + K2Cr2O7CrO2Cl2(B)(Reddish brown) + KHSO4 + NaHSO4 +H2O

CrO2Cl2 + NaOH  Na2CrO4(C)Yellow Colour + NaCl +H2O

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