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Question

For which of the following processes, $$\Delta S$$ is negative?


A
N2(g,273K)N2(g,300K)
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B
N2(g,1atm)N2(g,5atm)
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C
C(diamond)C(graphite)
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D
H2(g)2H(g)
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Solution

The correct option is B $${N}_{2}(g,1atm)\rightarrow {N}_{2}(g,5atm)$$
(A)When we increase the temperature of a gas then randomness is increased due to kinetic energy gained by molecules.
So, $$\Delta$$$$S>0$$

(B)When pressure increases then molecules of gas will come closer and intermolecular distance decreases so entropy will also decrease.
and $$\Delta$$$$S<0$$

(C)When Diamond is converted into graphite when it is heated to $$1500^oC$$ and entropy is increased so $$\Delta$$$$S>0$$

(D)$$H_2$$ molecule is converted into atoms, So entropy will increase.
So $$\Delta$$$$S>0$$


Chemistry

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