1
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 $\mathrm{Fe}^{2+}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

An unsaturated hydrocarbon $[\mathrm{A}]$ undergoes the following series of reactions. Identify $[\mathrm{A}]$.

COMEDK 2025 Morning Shift Chemistry - Hydrocarbons Question 1 English

A
Propyne
B
But-2-yne
C
But-1-yne
D
But-2-ene
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the compound which gives an optically active haloalkane on reaction with $\mathrm{H}_2$ / Ni on heating.

A B C D
COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 2 English 1 COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 2 English 2 COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 2 English 3 COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 2 English 4

A
A
B
B
C
D
D
C
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
For a given reaction of the type $\frac{3}{5} X(a q) \rightarrow \frac{1}{2} Y(a q)+Z(g)$, the correct expression for the rate of disappearance of $X$ with reference to $Y$ is ___________
A
$-d \frac{[X]}{d t}=+\frac{6}{5} d \frac{[Y]}{d t}$
B
$-d \frac{[X]}{d t}=+\frac{5}{6} d \frac{[Y]}{d t}$
C
$-d \frac{[X]}{d t}=+\frac{3}{10} d \frac{[Y]}{d t}$
D
$-d \frac{[X]}{d t}=d \frac{[Y]^{1 / 2}}{d t}$
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