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 :

Engineering

Chemistry

Dichromate and Permanganate Ion Reactions

Question

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 :

CrO₂Cl₂, KHSO₄

CrO₂Cl₂, Na₂CrO₄

CrO₂Cl₂, Na₂Cr₂O₇

Na₂CrO₄, CrO₂Cl₂

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These are reactions of chromyl chloride test for acid react Cl –.
NaCl(s) + K₂Cr₂O₇(s) + H₂SO₄ (conc) → CrO₂Cl₂ + Na₂SO₄ + K₂SO₄ + H₂O
CrO₂Cl₂ + NaOH → Na₂CrO₄ + NaCl + H₂O