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NEET UG CHEMISTRY MCQ: THERMODYNAMICS
1
Medium
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Analyzing
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Assertion (A): The dissolution of in water is endothermic but it dissolves in water.
Reason (R): On dissolution of , entropy increases.
Reason (R): On dissolution of , entropy increases.
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Correct option: B
Both Assertion and Reason are correct; Reason is not the correct explanation of Assertion
Option B (Both Assertion and Reason are correct; Reason is not the correct explanation of Assertion) is correct. NH4Cl dissolution is endothermic and spontaneous due to increased entropy, but the entropy increase isn't the *only* reason for dissolution.
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An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If is the initial temperature and 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 work done is negative.
Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is
Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is