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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

Among the following, the reaction that is accompanied by a decrease in the entropy is

Options

  1. AN 2 g + 3 H 2 g → 2 N H 3 g
  2. BC 6 H 12 O 6 s + 6 O 2 g → 6 C O 2 g + 6 H 2 O l
  3. CP C l 5 s → P C l 3 l + C l 2 g
  4. D2 H 2 O l → 2 H 2 g + O 2 g

Correct answer

A. N 2 g + 3 H 2 g → 2 N H 3 g

Step-by-step solution

Entropy is the measure of randomness. As the randomness (disorder) increases, entropy increases, The order of entropy is S o l i d ( p a r t i c l e s orderlyarranged ) < L i q u i d < G a s ( m o s t disordered ) Thus, in reaction N 2 g + 3 H 2 g → 2 N H 3 g Entropy decreases because number of gaseous molecules decreases.

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