K2Cr2O7 paper acidified with dilute H2SO4 turns green when exposed to (A) Hydrogen sulphide (B) Sulp — JEE Mains Chemistry Past Papers Chemistry Question
Question
K2Cr2O7 paper acidified with dilute H2SO4 turns green when exposed to (A) Hydrogen sulphide (B) Sulphur dioxide (C) Carbon dioxide (D) Sulphur trioxide
Answer: B
💡 Solution & Explanation
Cr2O72– + 2H+ + 3SO2 2Cr3+ (green) + 3SO42– + H2O.
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