The emf of cell T 1 underset ( 0.01 M ) mathop T 1 + \, C u 2+ underset ( 0.01M ) mathop \, Cu is 0.83 V at 298 K . It could be increased by :

increasing concentration of Cu 2+ ions

increasing concentration of Tl + ions

increasing concentration of both Tl + and Cu 2+ ions

decreasing concentration of both Tl + and Cu 2+ ions

Chemistry · Electrochemistry

JEE Main 2024 — 8 April, Shift 2 — Question 72

The emf of cell

$\text{T}1\left| \underset{\left( 0.01\text{M} \right)}{\mathop{\text{T}{{1}^{+}}}}\, \right|\left| \text{C}{{\text{u}}^{2+}}\underset{\left( 0.01M \right)}{\mathop{~}}\, \right|\text{Cu}$

is 0.83 V at 298 K . It could be increased by :

Option A:
increasing concentration of $\mathrm{Tl}^{+}$ ions
Option B:
increasing concentration of both $\mathrm{Tl}^{+}$ and $\mathrm{Cu}^{2+}$ ions
Option C:
decreasing concentration of both $\mathrm{Tl}^{+}$ and $\mathrm{Cu}^{2+}$ ions
Option D:
increasing concentration of $\mathrm{Cu}^{2+}$ ions
Correct

Answer: D

Step-by-step solution

$\begin{aligned}& T{{l}^{+}}+cu\to Tl+c{{u}^{+2}} \\ & E={{E}^{0}}-\frac{0.0591}{1}\log \frac{\left[ c{{u}^{+2}} \right]}{\left[ T{{l}^{+}} \right]} \\ & As\uparrow \left[ T{{l}^{+}} \right]\Rightarrow \downarrow ses\,\,\,\,\,\,\,\,\,\frac{\left[ c{{u}^{+2}} \right]}{\left[ T{{l}^{+}} \right]} \\ & As\,\,\left[ c{{u}^{+2}} \right]\uparrow ses\Rightarrow E.M.F\,\,\,will\,\,be\,\,\,increses \\ \end{aligned}$

Answer key and solution verified before publishing.

Practise Electrochemistry

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free

Exam: JEE Main 2024
Paper: 8 April, Shift 2
Subject: Chemistry
Chapter: Electrochemistry
Topic: Nernst Equation and Electrochemical Series

The reaction; 1/2 H 2( g)+ AgCl ( s) arrow H ( aq)^++ Cl ( aq)^-+ Ag ( s) occurs in which of the following galvanic cell :

Answer: D

Step-by-step solution

Practise Electrochemistry

More Electrochemistry questions from this paper