Hot concentrated sulpuric acis is a moderatly strong oxidizing agent. Which of the following reaction does not shwo oxidizing behaviour?

Options

A. `Cu + 2H_(2)SO_(4) to CuSO_(4) + SO_(2) + 2H_(2)O`
B. `3S + 2H_(2)SO_(4) to 3SO_(2) + 2H_(2)O`
C. `C + 2H_(2)SO_(4) to CO_(2) +2SO_(2) + 2H_(2)O`
D. `CaF_(2) + H_(2)SO_(4) to CaSO_(4) + 2HF`

Answer

D

Explanation

An oxidising agent is a species, which oxidises the other species and itself gets reduced.
(a) `overset(0)(Cu) + 2H_(2)SO_(4) to overset(+2)(Cu) SO_(4) + SO_(2) + 2H_(2)O`
(b) `3overset(0)S + 2H_(2)SO_(4) to 3overset(+4)S O_(2) + 2H_(2)O`
(c )` overset(0)C + H_(2)SO_(4) to overset(+4) C O_(2) + 2SO_(2) + 2H_(2)O`
(d) `overset(+2)(Ca) overset(-1)F_(2) + H_(2)SO_(4) to overset(+2)C a SO_(4) + 2Hoverset(-1)F`
In reaction (d), oxidation number of elements remains unchanged. Thus, in this reaction, `H_(2)SO_(4)` does not act as an oxidising agent.