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NTA Abhyas NEET2020ChemistryChemical EquilibriumPractice

For which of the following processes value of Δ S is negative?

Options

  1. AH 2 ( g ) → 2 H ( g )
  2. BN 2 (g)   (1   atm) → N 2 (g)   (8   atm)
  3. C2 S O 3 ( g ) → 2 S O 2 ( g ) + O 2 ( g )
  4. DC ( d i a m o n d ) → C ( g r a p h i t e )

Correct answer

B. N 2 (g)   (1   atm) → N 2 (g)   (8   atm)

Step-by-step solution

Processes (A) and (C) take place with the increase of no. of moles of gaseous species and hence the disorder or entropy increases. ( B ) on increasing pressure, disorder or randomness decreases and so also the entropy ( D ) is endothermic process and Δ S is positive.

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