NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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A gas occupies 2 liters at STP. It is provided 58.63 joule heat so that its volume becomes 2.5 litre at

1 \mathrm{~atm}

. Calculate change in its internal energy.

(1 \mathrm{lt} \mathrm{atm}=101.3 \mathrm{~J})

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Correct option: A

The question is incomplete and does not provide enough information to determine the change in internal energy. It seems there is a typo and the correct answer cannot be determined with the given information.

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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