NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Analyzing +4 | -1

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If

{T_i}

is the initial temperature and

{T_f}

is the final temperature, which of the following statements is correct?

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Correct option: A

{\left( {{T_f}} \right)_{\mathrm{irrev}}} > {\left( {{T_f}} \right)_{\mathrm{rev}}}

Option A (

{\left( {{T_f}} \right)_{\mathrm{irrev}}} > {\left( {{T_f}} \right)_{\mathrm{rev}}}

) is correct because in an irreversible adiabatic expansion, less work is done by the system, resulting in a smaller decrease in internal energy and a higher final temperature compared to a reversible adiabatic expansion.

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The internal energy of one mole of a gas is: For which of the process, ∆S is negative? The work done by a weightless piston in causing an expansion ∆V (at constant temperature), when the opposing pressure, P is variable, is given by: Assertion :- At constant pressure of the change

\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})

work done is negative.

Reason :- During phase transition work done is always negative. For the reaction,

\mathrm{X}_2 \mathrm{O_4(l}) \longrightarrow 2 \mathrm{XO}_2(\mathrm{g}), \Delta U=2.1 \mathrm{~kcal}, \Delta S=20 \mathrm{~cal} \mathrm{~K}^{-1}

300 \mathrm{~K}

. Hence,

\Delta G

is In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true