1
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
$$ -2552.2 \mathrm{~kJ} $$
2
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
3
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
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If 2 moles of $$\mathrm{C}_6 \mathrm{H}_6(\mathrm{~g})$$ are completely burnt $$4100 \mathrm{~kJ}$$ of heat is liberated. If $$\Delta H^{\circ}$$ for $$\mathrm{CO}_2(\mathrm{~g})$$ and $$\mathrm{H}_2 \mathrm{O}(l)$$ are $$-410$$ and $$-285 \mathrm{~kJ}$$ per mole respectively then the heat of formation of $$\mathrm{C}_2 \mathrm{H}_6(g)$$ is

A
$$-116 \mathrm{~kJ}$$
B
$$-375 \mathrm{~kJ}$$
C
$$-775 \mathrm{~kJ}$$
D
$$-885 \mathrm{~kJ}$$
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