(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 :

               XeF4 + SbF                                                                         5mark

Concept Videos :-

#2 | 15th Group: Properties: II
#3 | 15th Group: Ammonia

Concept Questions :-

group 15 ,preparation and properties
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