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When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas (A) was involved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).(i) Identify (A) and (B)(ii) Write the structures of (A) and (B)(iii) Why does gas (A) change to solid on cooling
