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प्रश्न
Concentrated sulphuric acid on reaction with copper evolves ______.
पर्याय
Hydrogen sulphide
Nitric acid
Carbon dioxide
Sulphur dioxide
MCQ
रिकाम्या जागा भरा
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उत्तर
Concentrated sulphuric acid on reaction with copper evolves sulphur dioxide.
Explanation:
Hot, concentrated sulphuric acid acts as an oxidising agent when reacting with copper metal, evolving pungent sulphur dioxide (SO2) gas:
\[\ce{Cu + 2H2O -> CuSO4 + 2H2O + SO2 ^}\]
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