1
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Two statements, one Assertion and the other Reason are given. Choose the correct option.

Assertion: For strong electrolytes the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal to $\lambda_{\mathrm{m}}$

Reason: For strong electrolytes, $\lambda_{\mathrm{m}}$ increases slowly with dilution due to increase in the distance between the ions and increase in ionic mobility

A
Assertion is correct but Reason is incorrect.
B
Both Assertion and Reason are incorrect.
C
Assertion is incorrect but Reason is correct.
D
Both Assertion and Reason are correct.
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
What is the reduction potential of a half-cell consisting of a Pt electrode dipped in $2.2 \mathrm{M} \mathrm{Fe}^{2+}$ and $0.04 \mathrm{M} \mathrm{Fe}^{3+}$ solution where the reaction taking place is conversion of $\mathrm{Fe}^{3+}$ ions to $\mathrm{Fe}^{2+}$ ?

$$\mathrm{E}^0\left(\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}\right)=0.771 \mathrm{~V}$$

A
0.598 V
B
0.723 V
C
0.668 V
D
0.719 V
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A current of 2.5 amperes is passed through 800 ml of 0.48 M solution of $\mathrm{CuSO}_4$ for 1.0 hour with a current efficiency of $80 \%$. If the volume of the solution remains unchanged, what is the final molarity of the solution?
A
0.386
B
0.315
C
0.433
D
0.298
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The EMF of the cell $\mathrm{Al} / \mathrm{Al}^{3+}(0.01 \mathrm{M}) \| \mathrm{Fe}^{2+}(0.02 \mathrm{M}) / \mathrm{Fe}$ is 1.209 V . The EMF of the cell can be increased by
A
increasing the concentration of $\mathrm{Al}^{3+}$ and $\mathrm{Fe}^{2+}$
B
increasing the concentration of $\mathrm{Al}^{3+}$
C
increasing the concentration of $\mathrm{Fe}^{2+}$
D
decreasing the concentration of $\mathrm{Al}^{3+}$ and $\mathrm{Fe}^{2+}$
COMEDK Subjects
EXAM MAP