NEET UG CHEMISTRY MCQ: THERMODYNAMICS

1 Hard

1 of 1

Analyzing +4 | -1

Work done by a sample of an ideal gas in a process

{A}

is double the work done in another process

{B}.

The temperature rises through the same amount in the two processes. If

C_{{A}}

and

C_{{B}}

are the molar heat capacities for the two processes, then

View answer and explanation

Correct option: B

C_{{A}}>C_{{B}}

Option B (CA > CB) is correct because work done is related to heat capacity and temperature change. Since work in A is double that in B for the same temperature rise, CA must be greater than CB.

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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