NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Standard state Gibbs free energy changes for the isomerization reaction,cis-2-pentene⇌trans-2-pentene is -3.67 kJ/mol at 400K. If more trans-2-pentene is added to the reaction vessel, then:

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Correct option: C

More cis-2-pentene is formed

Option C (More cis-2-pentene is formed) is correct because adding more trans-2-pentene will shift the equilibrium towards the reactants (cis-2-pentene) to counteract the change, according to Le Chatelier's principle.

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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