The GATE Grind

GATE 2023 MT – Question 12

Metallurgical Thermodynamics · Solutions and chemical potential · 1 mark · Multiple choice

Formation of an ideal solution leads to

  1. increase in entropy
  2. decrease in volume
  3. increase in enthalpy
  4. decrease in entropy

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Show answer and explanation

Correct answer: (A) increase in entropy

Explanation

Ideal mixing has $\Delta H_{mix}=0$ and $\Delta V_{mix}=0$, but $\Delta S_{mix}=-R\sum_i n_i\ln x_i>0$ for a genuine mixture.

Thus entropy increases, **A**.