Question

Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is

• A. ${\Delta }_{sys}S+{\Delta }_{surr}S$ $>$ $0$
• B. ${\Delta }_{sys}S-{\Delta }_{surr}S$ $>$ $0$
• C. ${\Delta }_{sys}S$ $>$ $0$ only
• D. ${\Delta }_{surr}S$ $>$ $0$ only

Answer 1

The correct option is A ${\Delta }_{sys}S+{\Delta }_{surr}S$ $>$ $0$

According to second law of Thermodynamics, for a spontaneous process, the total entropy change for a system and its surroundings increases.
Therefore,
${\Delta }_{sys}S+{\Delta }_{surr}S$ $>$ $0$