Reddish brown gas evolved when barium nitrate heated with sulphuric acid
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Explanation:
The nitrate ion can easily be identified by heating copper turnings along with concentrated sulphuric acid. Brown, pungent effervescence is observed which turns blue litmus red. Here sulphuric acid reacts with the nitrate ion to form nitric acid. Nitric acid then reacts with the copper turnings to form nitric oxide.
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