1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the enthalpy of formation of a diatomic molecule $$\mathrm{AB}$$ is $$-400 \mathrm{~kJ} / \mathrm{mol}$$ and the bond dissociation energies of $$\mathrm{A}_2$$ and $$\mathrm{B}_2$$ and $$\mathrm{AB}$$ are in the ratio $$2: 1: 2$$, what is the bond dissociation enthalpy of $$\mathrm{B}_2$$ ?

A
800 kJ/mol
B
600 kJ/mol
C
1600 kJ/mol
D
400 kJ/mol
2
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
$$-885 \mathrm{~kJ}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

For an adiabatic change in a system, the condition which is applicable is

A
$$q=0$$
B
$$w=0$$
C
$$q=-w$$
D
$$q=w$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$5.8 \mathrm{~g}$$ of a gas maintained at $$95^{\circ} \mathrm{C}$$ occupies the same volume as $$0.368 \mathrm{~g}$$ of hydrogen gas maintained at a temperature of $$17^{\circ} \mathrm{C}$$ and pressure being the same atmospheric pressure for both the gases. What is the molecular mass of the unknown gas?

A
44 g/mol
B
32 g/mol
C
71 g/mol
D
40 g/mol
COMEDK Subjects
EXAM MAP