Considering entropy(s) as a thermodynamic parameter, the criterion for the spontaneity of any process, the change in entropy is:

△ S_{s y s t e m} > 0

only

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△ S_{s u r r o u n d i n g} > 0

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(△ S_{s y s t e m} + △ S_{s u r r o u n d i n g}) > 0

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(△ S_{s y s t e m} - △ S_{s u r r o u n d i n g}) > 0

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Solution

The correct option is C $(△ S_{s y s t e m} + △ S_{s u r r o u n d i n g}) > 0$
According to the law of entropy (also known as the second law of thermodynamics), the entropy for the spontaneity of any process is always accompanied by an increase in total entropy of the universe i.e.
$△ S_{s y s t e m} + △ S_{s u r r o u n d i n g}$ .

Hence, $(△ S_{(s y s t e m)} + △ S_{(s u r r o u n d i n g)}) > 0$ .

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△ S = \frac{Q_{r e v}}{T} .

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Δ_{s y s} S + Δ_{s u r r} S > 0

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