Question

EΘ Values of some redox couples are given
below. On the basis of these values choose the
correct option.
EΘ values : Br₂/Br⁻ = + 1.90; Ag⁺ /Ag(s) = + 0.80
Cu²⁺ /Cu(s) = + 0.34; I₂(s) /I⁻ = 0.54
(a) Cu will reduce Br⁻ (b) Cu will reduce Ag
(c) Cu will reduce I⁻ (d) Cu will reduce Br₂

Answer 1

(d) Cu will reduce Br₂ is the answer

Answer 2

On the basis of the given value, the correct option is (d) Cu will reduce Br₂

Explanation:

Option (a): Cu will reduce Br⁻

The E° of copper < The E° of bromide.

Thus, the copper will not reduce Br⁻. So, this option is not correct.

Option (b): Cu will reduce Ag

The E° of copper < The E° of silver.

Thus, the copper will not reduce silver. So, this option is not correct.

Option (c): Cu will reduce I⁻

The E° of copper < The E° of iodine.

Thus, the copper will not reduce I⁻. So, this option is not correct.

Option (d): Cu will reduce Br₂

The E° value of Br₂ is 1.90 and the E° value of reduced Br⁻ is -1.90

The E° of copper > The E° of Br⁻

Thus, the copper will reduce Br⁻. So, this option is correct.