NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Analyzing +4 | -1

An ideal gas was subjected to a reversible adiabatic expansion then its initial volume was restored by reversible, isothermal compression. If '

q

' denotes the heat added to the system and

w

the work done on the system for the overall process then

View answer and explanation

Correct option: A

< 0

, q

< 0

Option A (w < 0, q < 0) is correct because in a reversible adiabatic expansion, no heat is exchanged (q=0), and the gas does work, so w < 0. During isothermal compression, work is done on the system, and heat is released, so w < 0 and q < 0 overall.

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The internal energy of one mole of a gas is: 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? 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