Competishun Header

Report Issue

JEE Advance2021
Paper-2
Multiple correct answers - Select all that apply
Question
Some standard electrode potentials at 298 K are given below: To a solution containing 0.001 M of $\mathrm{X}^{2+}$ and 0.1 M of $\mathrm{Y}^{2+}$, the metal rods X and Y are inserted (at 298 K ) and connected by a conducting wire. This resulted in dissolution of X . The correct combination(s) of $X$ and $Y$, respectively, is(are) (Given: Gas constant, $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$, Faraday constant, $\mathrm{F}=96500 \mathrm{C} \mathrm{mol}^{-1}$ )
Select ALL correct options:
A
Cd and Ni
B
Cd and Fe
C
Ni and Pb
D
Ni and Fe
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
⚠ Partially correct. Some answers are missing.
Solution
$\mathrm{x}(\mathrm{s}) \longrightarrow \mathrm{x}^{+2}(0.001 \mathrm{M})+2 \mathrm{e}^{-}($anode $)$
$\mathrm{y}^{+2}(0.1 \mathrm{M})+2 \mathrm{e}^{-} \longrightarrow \mathrm{y}$ (s) (cathode)

$\mathrm{E}_{\text {oell }}=\mathrm{E}^{\circ}{ }_{\text {cell }}-\frac{0.06}{2} \log \frac{\mathrm{x}^{+2}}{\mathrm{y}^{+2}}$
$E_{\text {cell }}=E^{\circ}{ }_{\text {cell }}+0.06$
(A) Cd and $\mathrm{Ni} \mathrm{E}_{\text {cell }}^{\circ}=+0.4-0.24$. $\mathrm{E}_{\text {cell }}=0.22$
(B) Cd and $\mathrm{Fe} \mathrm{E}^{\circ}{ }_{\text {cell }}=-0.04$; $\mathrm{E}_{\text {cell }}=0.02$
(C) Ni and Pb $\mathrm{E}_{\text {cell }}^{\circ}=0.11$; $\mathrm{E}_{\text {cell }}=0.17$
(D) Ni and $\mathrm{Fe} \mathrm{E}_{\text {cell }}^{\circ}=-02$; $\mathrm{E}_{\text {cell }}=-0.14$
since in $(A)(B)(C) E_{\text {cell }}$ is positive hence answer is $(A)(B)(C)$.
Question Tags
JEE Advance
Chemistry
Easy
Start Preparing for JEE with Competishun
Filters 0
JEE Main
JEE Advance
Easy
Medium
Hard
Showing 18 questions
Q JEE MAIN 20262026
Given below are two statements
Statement I: $\mathrm{H}_2 \mathrm{O}$ molecules move from the chamber 1 to chamber 2 .
Statement II:...
JEE MainChemistryMedium
View Solution→
QJEE MAIN 20212021
Which of the following molecules does not show stereo isomerism ?
JEE MainChemistryEasy
View Solution→
QJEE MAIN 2021 2021
Given below are two statements :
Statement-I : α and β forms of sulphur can change reversibly between themselves with...
JEE MainChemistryEasy
View Solution→
QJEE MAIN 20212021
Which one of the following statements is not true about enzymes ?
JEE MainChemistryEasy
View Solution→
Q JEE MAIN 20212021
The solubility product of $\mathrm{Pbl}_2$ is $8.0 \times 10^{-9}$. The solubility of lead iodide in 0.1 molar solution of lead...
JEE MainChemistryHard
View Solution→
QJEE MAIN 20222022
In Carius method of estimation of halogen. 0.45 g of an organic compound gave 0.36 g of AgBr. Find out...
JEE MainChemistryEasy
View Solution→
QJEE MAIN 20232023
The number of units, which are used to express concentration of solutions from the following is _______.
Mass percent,...
JEE MainChemistryEasy
View Solution→
QJEE MAIN 20222022
250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest...
JEE MainChemistryHard
View Solution→
QJEE MAIN 2019 2019
A compound ' $X$ ' on treatment with $\mathrm{Br}_2 / \mathrm{NaOH}$, provided $\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}$, which gives positive carbylamine test....
JEE MainChemistryMedium
View Solution→
QJEE MAIN 20232023
In the following reaction, 'A' is
JEE MainChemistryMedium
View Solution→
QJEE MAIN 20212021
Which one of the following reactions does not occur ?
JEE MainChemistryEasy
View Solution→
QJEE MAIN 2021 2021
The major products A and B formed in the following reaction sequence are :
JEE MainChemistryEasy
View Solution→
QJEE MAIN 2021 2021
Correct statement about the given chemical reaction is :
JEE MainChemistryEasy
View Solution→
QJEE MAIN 2021 2021
Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following...
JEE MainChemistryEasy
View Solution→
QJEE-MAIN 20202020
Three isomers A. B and C (mol. formula $\mathrm{C}_2 \mathrm{H}_7, \mathrm{~N}$ ) give the following results
JEE MainChemistryEasy
View Solution→
QJEE MAIN 20212021
In the chemical reactions given above A and B respectively are :
JEE MainChemistryEasy
View Solution→
QJEE MAIN 2019 2019
Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :
JEE MainChemistryEasy
View Solution→
QJEE MAIN 20222022
Stability of $\alpha$ - Helix structure of proteins depends upon
JEE MainChemistryEasy
View Solution→