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Question
When concentrated 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 added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).
1) Identify (A) and (B).
2) Write the structures of (A) and (B).
3) Why does gas (A) change to solid on cooling?
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Solution
1) A = NO2 ; B = N2O4
2)
3) It converts into solid because of NO2 form dimer i.e N2O4 at low temperature.
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