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Class 12th Chemistry 2018 Set1 Delhi Board Paper Solution

Question 24

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)

(i) Identify (A) and (B)

(ii) Write the structures of (A) and (B)

(iii) When does gas (A) change to solid on cooling ?


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