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Q.

Which of the following characteristics will always lead to a spontaneous chemical reaction?

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a

$ΔH = - ve; ΔS = + ve$

b

$ΔH = + ve; ΔS = - ve$

c

$ΔH = + ve; ΔS = + ve$

d

$ΔH = - ve; ΔS = - ve$

answer is D.

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Detailed Solution

$ΔH = - ve; ΔS = + ve$ of the following characteristics will always lead to a spontaneous chemical reaction.
$ΔG$ must be negative for a spontaneous reaction.
Since $ΔG = ΔH - TΔS$ , a reaction having $ΔH$ negative and $ΔS$ positive will have $ΔG$ negative at all temperatures.
Hence, option D is correct.

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