List of top Chemistry Questions on Thermodynamics asked in AP EAPCET

Identify the correct statements from the following:

• Bomb calorimeter is used to determine the heat absorbed by water in a chemical reaction at constant volume

• Heat capacity is an extensive property

• The units of entropy are \(J\,K^{-1}\)
The correct answer is

At T(K) in a reaction \(A(g) \rightarrow B(g) + C(g)\), x J of heat was absorbed and y J of work is done by the system. What is \(\Delta_r H\) (in J) for the reaction? (R= gas constant)

At constant temperature, one mole of an ideal gas of volume 2L expanded to 100 L against an external pressure of 1 atm under reversible conditions. What is the work done (in J)? (1 L atm = 101.3 J; \(\log 5 = 0.7\))

At constant temperature, one mole of an ideal gas of volume 2L was expanded to 100 L against an external pressure of 1 atm under reversible conditions. What is the change in internal energy? \((1 L atm=101.3~J; log~5=0.7)\)

What is the work done (in J $mol^{-1}$) to vaporise 1 mole of $H_2O(l)$ to $H_2O(g)$ at 1 bar pressure and $100^{\circ}C$? ($\Delta_{vap}H = 41$ kJ $mol^{-1}$; $\Delta U = 37.9$ kJ $mol^{-1}$)

An ideal gas expands from volume $V_{1}$ to $V_{2}$ through an isothermal reversible process. The work done by the system is given by

For a spontaneous process at constant temperature and pressure, the change in Gibbs free energy ($\Delta G$) is

The signs of $\Delta H$ and $\Delta S$ for a reaction to be spontaneous at all temperatures respectively are

At 273 K the maximum work done when pressure on 10g of hydrogen is reduced from 10atm to 1 atm under isothermal reversible conditions is

For which of the following process entropy change ($\Delta S$) is negative ?
I) Sublimation of dry ice
II) Freezing of water
III) Crystallisation of the dissolved substance
IV) Burning of rocket fuel

The number of extensive and intensive properties in the list given below is respectively:
Density, enthalpy, mass, temperature, volume, pressure

The signs of $\Delta$H and $\Delta$s for a reaction to be spontaneous at all temperatures respectively are

For which of the following process entropy change ($\Delta$S) is negative ?
• [I)] Sublimation of dry ice
• [II)] Freezing of water
• [III)] Crystallisation of the dissolved substance
• [IV)] Burning of rocket fuel

At 273 K the maximum work done when pressure on 10g of hydrogen is reduced from 10atm to 1 atm under isothermal, reversible conditions is

The standard Gibbs energy (\(\Delta G^\circ\)) for the following reaction is:
\[ A(s) + B^{2+} (aq) \rightleftharpoons A^{2+} (aq) + B(s), \quad K_c = 10^{12} \text{ at 25°C} \]

Identify the correct statements from the following:
(i) For adiabatic process, \(\Delta U = W_{\text{adiabatic}}\)
(ii) Work is a path function.
(iii) Volume is an extensive property.

Which of the following conditions are not suitable for a spontaneous reaction?

Which of the following are extensive properties?
\[ (A)\ \text{Heat Capacity} \] \[ (B)\ \text{Entropy} \] \[ (C)\ \text{Gibbs Energy} \] \[ (D)\ \text{Concentration} \] \[ (E)\ \text{Vapour Pressure} \]

Identify the direction/process in which the entropy decreases

For a reaction \[ 2CO(g)+O_2(g)\rightleftharpoons 2CO_2(g), \] \(\Delta_rG^\circ=-128\,\text{kJ}\) at \(300\,\text{K}\). If \(\Delta_rS^\circ\) of the reaction is \(-40\,\text{J K}^{-1}\), calculate \(\Delta_rU\) of the reaction.

Which of the following equations are correct?
\[ (A)\ U=H-PV \] \[ (B)\ G=H-TS \] \[ (C)\ U=q+W \]

Identify the correct statements from the following
\[ \text{I. At }0\,K,\text{ the entropy of pure crystalline materials approaches zero.} \] \[ \text{II. Entropy for the process }H_2O(l)\longrightarrow H_2O(g)\text{ decreases.} \] III. Gibbs energy is a state function.