The reactions in which conc. `H_(2)SO_(4)` is used as an oxidising agent are
I. `2HI+H_(2)SO_(4)rarrI_(2)+SO_(2)+2H_(2)O`
II. `NaCl+2H_(2)SO_(4)rarrNaHSO_(4)+HCl`
III. `CaF_(2) | H_(2)SO_(4)rarrCaSO_(4)+2HF`
IV. `Cu+2H_(2)SO_(4)rarrCuSO_(4)+SO_(2)+2H_(2)O`
Choose the correct option.

Options

A. I and II
B. II and III
C. I and III
D. I and IV

Answer

D

Explanation

In the following reactions , conc. `H_(2)SO_(4)` is used as an oxidising agent .
`2Hl + H_(2)SO_(4) rarr l_(2) + SO_(2) + 2H_(2)O`
`Cu + 2H_(2)SO_(4) rarr CuSO_(4) + SO_(2) + 2H_(2)O`