Some properties of sulphuric acid are listed below . Choose the role played by sulphuric acid as A,B,C or D which is responsible for the reactions I ] to v] . Some role/s may be repeated.
A : Dilute acid
B : Dehydrating agent
C : Non - volatile acid
D : Oxidising agent
(i) `CuSO_(4)*5H_(2)Ooverset(Conc .H_(2)SO_(4))toCuSO_(4)+5H_(2)O`
(ii) `S+2H_(2)SO_(4)[conc.]to3SO_(2)++2H_(2)O`
(iii) `NaNO_(3)+H_(2)SO_(4)[conc.]overset(lt200^(@)C)toNaHSO_(4)+HNO_(3)`
(iv) `Zn+2H_(2)SO_(4)[conc.]toZnSO_(4)+SO_(2)+2H_(2)O`