1.

Hot concentrated sulphuric acid is a moderately strong oxidising agent. Which of the following reactions does not show oxidising behaviour ?

Answer»

`Cu + 2 H_(2)SO_(4) rarr CuSO_(4) + SO_(2) + 2H_(2) O`
`S + 2H_(2)SO_(4) rarr 3 SO_(2)+ 2H_(2)O`
`C + 2 H_(2) SO_(4) rarr CO_(2) + 2SO_(2)+ 2H_(2)O`
`CaF_(2) + H_(2)SO_(4) rarr CaSO_(4) + 2HF`

Solution :`CaF_(2) + H_(2)SO_(4) rarr CaSO_(4) + 2HF`
(a stronger acid displaces a weaker acid from its salts).


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