An ideal gas absorb $50\, \mathrm{cal}$ heat and expand in the vaccum from $5 \mathrm{~L}$ to $15 \mathrm{~L}$. Change in its internal energy is :-

NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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An ideal gas absorb

50\, \mathrm{cal}

heat and expand in the vaccum from

5 \mathrm{~L}

15 \mathrm{~L}

. Change in its internal energy is :-

View answer and explanation

Correct option: B

50\, \mathrm{cal}

Option B (50 cal) is correct because in a vacuum expansion, no external pressure exists, so no work is done, and the heat absorbed equals the change in internal energy.

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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