NEET Solved Paper 2019 Question 1
Question: In which case change in entropy is negative? [NEET 5-5-2019]
Options:
A) Sublimation of solid to gas
B) $ 2H(g)\to H _2(g) $
C) Evaporation of water
D) Expansion of a gas at temperature
Show Answer
Answer:
Correct Answer: B
Solution:
[a] Evaporation of water $ \Delta S=\oplus $
[b] Expansion of gas at constant temperature $ =\oplus $
[c] $ S\to g\oplus $
[d] $ \underset{(g)}{\mathop{2H}},\to \underset{(g)}{\mathop{H _2}},\Theta $
