Assertion :An exothermic process, non-spontaneous at high temperature, amy become spontaneous at low temperature. Reason: With decrease in temperature, randomness (entropy) decreases.

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Reaction is exothermic,
so $Δ H = - v e$
and as $Δ G = Δ H - T Δ S > 0$ at high temperature and reaction will be spontaneous at low temperature as
$Δ G = Δ H - T Δ S < 0$
Also,
with decrease in temperature, randomness (entropy) decreases because motion of particles decreases and their velocity decreases so they have less entropy at lower temperature.

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