1
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
$-587 \mathrm{~kJ} / \mathrm{mol}$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The Enthalpy of combustion of $$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}(\mathrm{s})$$ at $$25^{\circ} \mathrm{c}$$ and 1.0 atm pressure is $$-2546 \mathrm{~kJ} / \mathrm{mol}$$. What is the Internal energy change for this reaction?

A
$$ -2544.8 \mathrm{~kJ} $$
B
$$ -2539.8 \mathrm{~kJ} $$
C
$$ -2560.3 \mathrm{~kJ} $$
D
$$ -2552.2 \mathrm{~kJ} $$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Given :

$$ \begin{gathered} \Delta \mathrm{H}^0 \mathrm{f}_{\text {of }} \mathrm{CO}_2(\mathrm{~g})=-393.5 \mathrm{~kJ} / \mathrm{mol} \\ \Delta \mathrm{H}^0{ }_{\mathrm{f}} \text { of } \mathrm{H}_2 \mathrm{O}(\mathrm{l})=-286 \mathrm{~kJ} / \mathrm{mol} \\ \Delta \mathrm{H}^0{ }_{\mathrm{f}} \text { of } \mathrm{C}_3 \mathrm{H}_6(\mathrm{~g})=+20.6 \mathrm{~kJ} / \mathrm{mol} \end{gathered} $$

$$\Delta \mathrm{H}^0$$ isomerisation of Cyclopropane to Propene $$=-33 \mathrm{~kJ} / \mathrm{mol}$$

What is the standard enthalpy of combustion of Cyclopropane?

A
$$-2092$$ kJ/mol
B
$$-1985$$ kJ/mol
C
$$+2384$$ kJ/mol
D
$$-2051$$ kJ/mol
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

5.0 moles of an Ideal gas at 3.0 atm pressure and $$27^{\circ} \mathrm{C}$$ is compressed isothermally to half its volume by application of an external pressure of $$3.5 \mathrm{~atm}$$. What is the amount of work done (in joules) on the gas? Given: $$1 \mathrm{~L} \mathrm{~atm}=101.3 \mathrm{~J}: \mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}{ }^{-1} \mathrm{~mol}^{-1}$$

A
$$-3559.9$$
B
7268.3
C
$$-10367.4$$
D
14359.2
COMEDK Subjects
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