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(a) 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) Why does gas (A) change to solid on cooling ?

(b) Arrange the following in the decreasing order of their reducing character :

     HF, HCl, HBr, HI

(c) Complete the following reaction :

     $XeF_{4}+SbF_{5}\rightarrow$

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