In which of the following conditions a chemical reaction can not occur

In which of the following conditions a chemical reaction can not occur

Options

(a) ΔH and ΔS increase and TΔS > ΔH
(b) ΔH and ΔS decrease and ΔH > TΔS
(c) ΔH increases and ΔS increases
(d) ΔH decreases and ΔS increases

Correct Answer:

ΔH increases and ΔS increases

Explanation:

(i)When ΔH and ΔS increase, then , if TΔS > ΔH the reaction is spontaneous.
Therefore ΔG = ΔH – TΔS = -ve.
(ii)When ΔH and ΔS decrease,then if ΔH > TΔS. This makes ΔG is -ve and process is spontaneous.
(iii) If , ΔH increases and ΔS decreases, then ΔG is +ve and process is non-spontaneous.
(iv) If ΔH decrease and ΔS increases, then ΔG is -ve and process is spontaneous.

admin:

Related Questions

  1. The solubility product of AgI at 25⁰C is 1.0 ˣ 10⁻¹⁶ mol² L⁻².
  2. When carbon monoxide is passed over solid caustic soda heated to 200▫ C it forms
  3. Which of the following is the most electropositive element
  4. Non – lanthanide element is
  5. Treatment of acetaldehyde with ethyl magnesium bromide and subsequent hydrolysi