1
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
$-d \frac{[X]}{d t}=d \frac{[Y]^{1 / 2}}{d t}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following statements is correct?.
A
The major product formed when 2- Methylpropene reacts with dilute $\mathrm{H}_2 \mathrm{SO}_4$ is tert. butyl alcohol.
B
The Electrophilic addition to an unsymmetrical alkene always occurs through the formation of a more stable Carbanion intermediate.
C
Between the two alkenes - (i) $\left(\mathrm{CH}_3\right)_2-\mathrm{C}=\mathrm{CH}-\mathrm{CH}_3$ and (ii). $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}_3$, compound (i) will show geometrical isomerism
D
Greater the number of alkyl groups attached to the double bonded Carbon atoms, the less stable is the alkene.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Given that the standard enthalpy of combustion of $\mathrm{C}_{(\mathrm{S})}$ and $\mathrm{CS}_2(\mathrm{l})$ are -393.3 and $-1108.76 \mathrm{~kJ} / \mathrm{mol}$ respectively and the standard enthalpy of formation of $\mathrm{CS}_2$ is $128.02 \mathrm{~kJ} / \mathrm{mol}$. What is $\Delta H_f^0$ of $\mathrm{SO}_2$ ?
A
$-510.6 \mathrm{~kJ} / \mathrm{mol}$
B
$-293.72 \mathrm{~kJ} / \mathrm{mol}$
C
$-321.2 \mathrm{~kJ} / \mathrm{mol}$
D
$-587 \mathrm{~kJ} / \mathrm{mol}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Choose the correct statement.
A
A solution formed by adding Carbon di-sulphide to Acetone forms a maximum boiling azeotrope.
B
Hypotonic solution is more concentrated with respect to the other solution separated by a semi permeable membrane
C
For a solvent, $\quad K_b=\frac{R \times M_1 \times T_b^2}{1000 \times \Delta \text { Hvap }}$ $\left(\mathrm{R}=\mathrm{Gas}\right.$ constant, $M_1=$ Molar mass of solvent, $T_b=B \cdot P$ of the solvent $)$
D
A 1.0 molal solution of Glucose in water is more concentrated than 1.0 M glucose solution in the same solvent.
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