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Chemistry-

General

Easy

Question

If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then

$∆$ H is -ve, $∆$ S is +ve
$∆$ H and $∆$ S both are +ve
$∆$ H and $∆$ S both are -ve
$∆$ H is +ve and $∆$ S is -ve

The correct answer is: $increment$ H and $increment$ S both are +ve

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Although the dissolution of ammonium chloride in water is an endothermic reaction, even then it is spontaneous because:

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At 27°C the reaction, $C subscript 6 end subscript H subscript 6 left parenthesis l right parenthesis end subscript plus fraction numerator 15 over denominator 2 end fraction O subscript 2 left parenthesis g right parenthesis end subscript rightwards arrow 6 C O subscript 2 left parenthesis g right parenthesis end subscript plus 3 H subscript 2 end subscript O subscript left parenthesis 1 right parenthesis end subscript$ proceeds spontaneously because the magnitude of

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$H subscript left parenthesis a q right parenthesis end subscript superscript plus end superscript plus O H subscript left parenthesis a q right parenthesis end subscript superscript minus end superscript rightwards arrow H subscript 2 end subscript O subscript left parenthesis 1 right parenthesis end subscript semicolon capital delta H equals negative v e$ and $increment$ G= -ve then the reaction is

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