# Thermodynamics · Chemistry · COMEDK

Start Practice## MCQ (Single Correct Answer)

COMEDK 2024 Evening Shift

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 \ma...

COMEDK 2024 Evening Shift

Given :
$$
\begin{gathered}
\Delta \mathrm{H}^0 \mathrm{f}_{\text {of }} \mathrm{CO}_2(\mathrm{~g})=-393.5 \mathrm{~kJ} / \mathrm{mol} \\
\Delta \math...

COMEDK 2024 Evening Shift

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 externa...

COMEDK 2024 Morning Shift

The standard enthalpy of formation of $$\mathrm{CH}_4$$, the standard enthalpy of sublimation of Carbon and the bond dissociation enthalpy of Hydrogen...

COMEDK 2024 Morning Shift

Given: $$\Delta \mathrm{G}^0{ }_{\mathrm{f}}$$ of $$\mathrm{C}_2 \mathrm{H}_2$$ is $$2.09 \times 10^5 \mathrm{~J} / \mathrm{mol}$$ and $$\Delta \mathr...

COMEDK 2024 Morning Shift

If the enthalpy of formation of a diatomic molecule $$\mathrm{AB}$$ is $$-400 \mathrm{~kJ} / \mathrm{mol}$$ and the bond dissociation energies of $$\m...

COMEDK 2023 Morning Shift

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 ...

COMEDK 2023 Morning Shift

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

COMEDK 2023 Evening Shift

$$5.8 \mathrm{~g}$$ of a gas maintained at $$95^{\circ} \mathrm{C}$$ occupies the same volume as $$0.368 \mathrm{~g}$$ of hydrogen gas maintained at a...

COMEDK 2023 Evening Shift

Gaseous Nitrous oxide decomposes at $$298 \mathrm{~K}$$ to form Nitrogen gas and Oxygen gas. The $$\Delta \mathbf{H}$$ for the reaction at $$1.0 \math...

COMEDK 2023 Evening Shift

A Gas taken in a closed vessel is heated from $$54^{\circ} \mathrm{C}$$ to $$1254^{\circ} \mathrm{C}$$. The pressure of the gas becomes ___________ ti...

COMEDK 2022

Which of the following are not path functions?
I. H $$-$$ TS
II. W
III. q
IV. q + W

COMEDK 2022

The relation between work done in reversible and irreversible process is

COMEDK 2022

In which of the following changes, entropy decreases?

COMEDK 2022

The difference between heat capacity at constant pressure and heat capacity at constant volume is

COMEDK 2021

When the expansion of a gas occurs in vacuum and at constant volume, then

COMEDK 2021

The change in the energy of system if 500 cal of heat energy are added to a system and system does 350 cal of work on the surroundings will be

COMEDK 2021

Calculate the difference between C$$_p$$ and C$$_V$$ for 10 moles of an ideal gas

COMEDK 2021

The value of $$\Delta G^\circ$$ for the phosphorylation of glucose in glycolysis is 13.8 kJ/mol. The value of $$K_C$$ at 298 K is

COMEDK 2020

Which of the following is an intensive property?

COMEDK 2020

Thermodynamic standard conditions of
temperature and pressure are

COMEDK 2020

In which of the following process, a maximum
increase in entropy is observed?

COMEDK 2020

Consider the reaction,
C(s) + O$$_2$$(g) $$\rightarrow$$ CO$$_2$$(g) + 393.5 kJ
The signs of $$\Delta H,\Delta S$$ and $$\Delta G$$ respectively are...

COMEDK 2020

Entropy of the universe is