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  • In which of the following reactions conc. H _ 2 SO _4 is used as an oxidising reagent ?

In which of the following reactions conc. H_{2}SO_{4} is used as an oxidising reagent?

(i) CaF_{2}+ H_{2}SO_{4} \rightarrow CaSO_{4}+ 2HF

(ii) 2HI + H_{2}SO_{4} \rightarrow I_{2} + SO_{2}+ 2H_{2}O

(iii) Cu + H_{2}SO_{4} \rightarrow CuSO_{4} + SO_{2}+ 2H_{2}O

(iv) NaCl + H_{2}SO_{4} \rightarrow NaHSO_{4} + HCl

Answers (1)

The answer is the option (ii, iii). Amongst the given options, (ii). and (iii). represent oxidizing behaviour of H_{2}SO_{4}. The oxidizing agent reduces itself in the process. In option b, it oxidises HI and gets reduced to SO_{2} .Here,

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