NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी NEET PYQ-Thermodynamics

  • question_answer
    In which case change in entropy is negative?                                                           [NEET 2019]

    A)  Sublimation of solid to gas

    B)  \[2H(g)\to {{H}_{2}}(g)\]

    C)  Evaporation of water

    D)  Expansion of a gas at temperature

    Correct Answer: B

    Solution :

    [b] [a] Evaporation of water \[\Delta S=\oplus \]
    [b] Expansion of gas at constant temperature\[=\oplus \]
    [c] \[S\to g\oplus \]
    [d] \[\underset{(g)}{\mathop{2H}}\,\to \underset{(g)}{\mathop{{{H}_{2}}}}\,\Theta \]


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