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JEE • CHEMISTRY • THERMODYNAMICS

Thermodynamics practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 91-92 of 92 questions

91 Hard

91 of 92

Application +4 | -1

Enthalpy of the reaction

\mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq}) \rightarrow

\mathrm{AgBr}(\mathrm{s})

-84.54 \mathrm{~kJ}.

Magnitude of enthalpies of formation of

\mathrm{Ag}^{+}(\mathrm{aq})

and

\mathrm{Br}^{-}(\mathrm{aq})

is in

8:9

ratio but their signs are opposite. Enthalpy of formation of

\mathrm{AgBr}

-99.54 \mathrm{~kJ} / \mathrm{mol}.

The magnitude of enthalpy of formation of

\mathrm{Ag}^{+}(\mathrm{aq})

View answer and explanation

Correct option: A

120 \mathrm{~kJ} / \mathrm{mol}

The correct answer is A (

120 \mathrm{~kJ} / \mathrm{mol}

) because it is derived from Hess's Law and the given enthalpy changes for the reactions, considering the ratio of enthalpies of formation of Ag+(aq) and Br-(aq).

92 Hard

92 of 92

Application +4 | -1

2 moles of an ideal gas at

{27^0}C

temperature is expanded reversibly from 2L to 20L. Find entropy change (R=2cal/mol K).

View answer and explanation

Correct option: D

9.2

Option D (9.2) is correct because the entropy change is calculated using the formula for reversible expansion of an ideal gas.

Revision notes and key takeaways

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Showing 91-92 of 92 questions

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