how does entropy change with decrease in pressure?

Entropy of the system decreases with increase in pressure.

Entropy is the degree of randomness of the system.  If pressure on the system is increased , in general the randomness  of the particles gets reduced this is because the volume of system i.e. space available for the movement of the particle decrease with the increase in pressure.

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as entropy is inversely proportional to temperature, for reversible reaction 

then for reversible reaction, with increase in temperature entropy increases.

Hope, you are satisfied.

:D

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