NDA 2026 Chemistry question
Consider the following pairs of reactions and properties : Reactions : Properties I. Fe\,(s) + 2HCl\,(aq) \rightarrow FeCl_2\,(aq) + H_2\,(g) : Fe is reductant II. Zn\,(s) + CuSO_4\,(aq) \rightarrow ZnSO_4\,(aq) + Cu\,(s) : Cu is being reduced III. Br_2\,(l) + 2I^-\,(aq) \rightarrow 2Br^-\,(aq) + I_2\,(s) : is reductant IV. : C atom in is oxidized Which of the above pairs are correct?
Answer: (C)
Solution
In I, Fe goes from 0 to +2, so it is oxidised and acts as the reductant. In II, copper goes from +2 to 0 and is reduced. In III, goes from 0 to –1;
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