Thermodynamics

The work done during reversible isothermal expansion of one mole of hydrogen gas at $25°C$ from pressure of 20 atmosphere to 10 atmosphere is:
(Given $\mathrm{R}=2.0 \mathrm{cal} {\mathrm{K}}^{-1}{\mathrm{mol}}^{-1}$)

[NEET 2024]

In which of the following processes entropy increases?

A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. $2{\mathrm{NaHCO}}_{3\left(\mathrm{s}\right)}\to {\mathrm{Na}}_2{\mathrm{CO}}_{3\left(\mathrm{s}\right)}+{\mathrm{CO}}_{2\left(\mathrm{g}\right)}+{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{g}\right)}$
D. ${\mathrm{Cl}}_{2\left(\mathrm{g}\right)}\to 2{\mathrm{Cl}}_{\left(\mathrm{g}\right)}$

Choose the correct answer from the options given below

[NEET 2024]

The work done during reversible isothermal expansion of one mole of hydrogen gas at $25°C$ from pressure of 20 atmosphere to 10 atmosphere is:
(Given $\mathrm{R}=2.0 \mathrm{cal} {\mathrm{K}}^{-1}{\mathrm{mol}}^{-1}$)

In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. $2NaHC{O}_{3\left(s\right)}\to N{a}_{2}C{O}_{3\left(s\right)}+C{O}_{2\left(g\right)}+H_2{O}_{\left(g\right)}$
D. $C{l}_{2\left(g\right)}\to 2C{l}_{\left(g\right)}$

Choose the correct answer from the options given below:

A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to $\mathrm{N}\rightleftharpoons \mathrm{D}$. At 60ºC, the concentrations of both N and D are equal at equilibrium, and the standard enthalpy change of denaturation is 666 $\mathrm{kJ} {\mathrm{mol}}^{-1}$. The standard entropy change ($∆\mathrm{S}º$ in $\mathrm{kJ} {\mathrm{K}}^{-1} {\mathrm{mol}}^{-1}$) of the protein upon denaturation at 60ºC is closest to

[Re-NEET 2026]

For the following reaction at \(\mathrm{300 ~K}\)

$A_2\left(g\right)+3B_2\left(g\right)\to 2A{B}_3\left(g\right)$

the enthalpy change is \(\mathrm{+15 ~kJ}\), then the internal energy change is

[Re-NEET 2024]

For the following reaction at \(\mathrm{300 ~K}\)

$A_2\left(g\right)+3B_2\left(g\right)\to 2A{B}_3\left(g\right)$

the enthalpy change is \(\mathrm{+15 ~kJ}\), then the internal energy change is

[Re-NEET 2024]

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres

[Re-NEET 2024]

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres :