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When conc. sulphuric acid was added to an unknown salt present in a test tube, a brown gas (A) was evolved. This gas intensified when copper turnings were also added into this tube. On cooling, the gas ‘A’ changed into a colourless gas ‘B’. Identify the gases A and B.

When conc. sulphuric acid was added to an unknown salt present in a test tube, a
brown gas (A) was evolved. This gas intensified when copper turnings were also
added into this tube. On cooling, the gas ‘A’ changed into a colourless gas ‘B’.
Identify the gases A and B.

Grade:Upto college level

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