Which of the following transformations can be carried out by using HI

1.	Which of the following transformations can be carried out by using HI as a reducing agent, under acidic conditions?[Given : I2(s) → 2I−; E° = 0.54 V](i) Cu+ → Cu(s); E° = 0.52 V(ii) Cr3+ → Cr2+; E° = − 0.41 V(iii) Fe3+ → Fe2+; E° = 0.77 V(iv) Fe2+ → Fe(s); E° = − 0.44 V(a) (i) and (iii)(b) (ii) and (iv)(c) Only (iii)(d) Only (ii)
Answer» Answer is : (c) Only (iii) The more positive E° value of metal, feasible transformation can be carried out by using HI as reducing agent under acidic conditions. As E° = 0.77 V(Fe³⁺ → Fe²⁺) is more positive than, E° = 0.54(I₂(s) → 2I⁻) thus can be used for carrying out transformation as it is the strongest oxidising agent among the other given options.

Which of the following transformations can be carried out by using HI as a reducing agent, under acidic conditions?[Given : I2(s) → 2I−; E° = 0.54 V](i) Cu+ → Cu(s); E° = 0.52 V(ii) Cr3+ → Cr2+; E° = − 0.41 V(iii) Fe3+ → Fe2+; E° = 0.77 V(iv) Fe2+ → Fe(s); E° = − 0.44 V(a) (i) and (iii)(b) (ii) and (iv)(c) Only (iii)(d) Only (ii)

Answer»

Answer is : (c) Only (iii)

The more positive E° value of metal, feasible transformation can be carried out by using HI as reducing agent under acidic conditions.

As E° = 0.77 V(Fe³⁺ → Fe²⁺) is more positive than, E° = 0.54(I₂(s) → 2I⁻) thus can be used for carrying out transformation as it is the strongest oxidising agent among the other given options.

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