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An element 'A' exists as a yellow solid in standard state. It forms a volatile hydride 'B' which is a foul smelling gas and is extensively used in qualitative analysis of salts. When treated with oxygen, 'B' forms an oxide 'C' which is a colourless and pungent smelling gas. The gas when passed through acidified KMnO_(4) solution, decolourises it. 'C' gets oxidised to another oxide 'D' in the presence of heterogeneous catalyst. Identify A, B, C, D and also give the chemical equations of reaction of 'C' with acidified KMnO_(4) solution and for conversion of 'C' into 'D'. |
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Answer» Solution :(i) The data suggests that the yellow solid 'A' is sulphur `(S_(8))`. The volatile hydride 'B' with a punget smell is hydrogen sulphides `(H_(2)S)` gas. Upon treatment with oxygen, `H_(2)S` is converted to sulphur dioxide `(SO_(2))` which is a colourless pungent smelling gas 'C'. (iii) The gas 'C' DECOLOURISES acidified `KMnO_(4)` solution and is also converted another oxide `SO_(3)` 'D' in the presence of heterogeneous catalyst platinised ASBESTOS. The chemical reactions involved are as follow : `underset((A))(S_(8)(s))+8H_(2)(g) overset("heat") to underset((B))(8H_(2)S(g))` `underset((B))(2H_(2)S(g))+3O_(2)(g) overset("heat") to underset((C ))(2SO_(2)(g))+2H_(2)O(g)` `underset((C ))(2SO_(2)(g))+O_(2)(g) overset(Pt)to underset((D))(2SO_(3))(g)` `2KMnO_(4)+3H_(2)SO_(4)to K_(2)SO_(4)+2MnSO_(4)+3H_(2)O+5(O)` `[SO_(2)+2H_(2)O to H_(2)SO_(4)+2H]xx5` `(2H+O to H_(2)O xx5)/(underset(("Violet"))(2KMnO_(4))+5SO_(2)+2H_(2)O to underset(("Colourless"))(K_(2)SO_(4)) +underset(("Colourless"))(2MnSO_(4))+2H_(2)SO_(4)` |
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