Second Law of Thermodynamics

The adsorption of a gas at the boiling point of the gas follows the isotherm shown in the figure. Identify the correct thermodynamic properties at point $C.$

A heat engine absorbs heat ${\mathrm{Q}}_1$ at temperature ${\mathrm{T}}_1$ and heat ${\mathrm{Q}}_2$ at temperature ${\mathrm{T}}_2$. Work done by the engine is $\left({\mathrm{Q}}_1+{\mathrm{Q}}_2\right) \mathrm{J}$. This data

The $\mathrm{SI}$ unit of $∆\mathrm{S}$ is 

What does entropy measure?

The change in entropy at equilibrium is 

Which of the following statement is NOT correct, according to second law of thermodynamics?

Enthalpy ($∆$H) for the reaction, $\mathrm{Zn}+2\mathrm{AgCl}\to {\mathrm{ZnCl}}_2+2\mathrm{Ag}\mathrm{ }\mathrm{at} 300 \mathrm{K} \mathrm{temperature} \mathrm{is}-218\mathrm{ }\mathrm{KJ}/\mathrm{mole}$ and emf of the cell was $1.015\mathrm{ }\mathrm{V}\cdot \mathrm{Then} \mathrm{the} \mathrm{vaule} \mathrm{of} {\left(\frac{\mathrm{dE}}{\mathrm{dT}}\right)}_{\mathrm{p}}$ of the cell is?

In Carnot cycle, an ideal gas is taken through 4 reversible steps as shown in the diagram.



Which of the following statement(s) $is/are$ correct?
(i) ΔU is positive in the $2^{nd}$ step between points 2 and 3.
(ii) ΔU is positive in the $4^{th}$ step between points 4 and 1.
(iii) ΔU is negative in the $2^{nd}$ step between points 2 and 3.
(iv) Temperature at point 4 is higher than point 2.

Find the amount of heat energy supplied to a Carnot engine from the source in each cycle if the engine is working between $300 \mathrm{K}$ and $600 \mathrm{K}$ and it has a work output of $800 \mathrm{J}$ per cycle.

The difference in $\mathrm{\Delta }$H and $\mathrm{\Delta }$U from combustion of solid benzoic acid at 300K is equal to :

A piece of ice kept at room temperature melts on its own . This reaction is governed by which law?

Identify the correct statement regarding a spontaneous process:

Consider entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is

What percentage ${\mathrm{T}}_1$ is of ${\mathrm{T}}_2$ for a $10 \mathrm{\%}$ efficiency of a heat engine? ${\mathrm{T}}_1$ is the temperature of sink and ${\mathrm{T}}_2$ is the temperature of heat reservoir.

Which of the following is the most effective way to increase the efficiency of the carnot engine?

For a perfectly crystalline solid C_p,m = aT³ , where a is constant. If C_p,m is $\text{0.42 }\frac{\text{J}}{\text{K mol}}$ at 10 K, molar entropy at 20 K is :

A piece of ice kept at room temperature melts of its own. This reaction is governed by which law?

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10$\mathrm{d}{\mathrm{m}}^3$ to a volume of 100 $\mathrm{d}{\mathrm{m}}^3\mathrm{ }\mathrm{a}\mathrm{t}\mathrm{ }27\mathrm{℃}$ is

The efficiency of a Carnot engine is $50\%$ and temperature of sink is $500 \mathrm{K}$. If temperature of source is kept constant and its efficiency raised to $60\%$, then the required temperature of sink will be:

The efficiency of the reversible cycle in the given figure is