Match the following : (Assume only reactants were present initially).

Column-I	Column-II
A. N2(g)+3H2(g)⇌2NH3(g)(t=3000C)	PΔng>0
B. PCl5(g)⇌PCl3(g)+Cl2(g)(t=500C)	Q Kp<Kc
C. C(s)+H2O(g)⇌CO(g)+H2(g)	R Kp not defined
D. CH3COOH(l)+C2H5OH(l)⇌CH3COOC2H5(l)+H2O(l)	S Pinitial>Peq.

Explanation

A. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) at 300°C

• Δng (Change in moles of gases):
  • Reactants: 1 mol N₂ + 3 mol H₂ = 4 moles
  • Products: 2 moles NH₃
  • Δng = 2 - 4 = -2
• Relationship between Kp and Kc: Since Δng < 0, Kp < Kc.
• Initial and equilibrium pressures: As the reaction proceeds, the number of gas moles decreases, leading to a decrease in pressure. Therefore, Pinitial > Peq.

B. PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) at 50°C

• Δng:
  • Reactants: 1 mol PCl₅
  • Products: 1 mol PCl₃ + 1 mol Cl₂ = 2 moles
  • Δng = 2 - 1 = +1
• Relationship between Kp and Kc: Since Δng > 0, Kp > Kc.
• Initial and equilibrium pressures: As the reaction proceeds, the number of gas moles increases, leading to an increase in pressure. Therefore, Pinitial < Peq.

C. C(s) + H₂O(g) ⇌ CO(g) + H₂(g)

• Δng:
  • Reactants: 1 mol H₂O (gas)
  • Products: 1 mol CO (gas) + 1 mol H₂ (gas) = 2 moles
  • Δng = 2 - 1 = +1
• Kp Definition: Kp is defined for reactions involving gases. Since there is a change in the number of moles of gases, Kp is defined for this reaction.

D. CH₃COOH(l) + C₂H₅OH(l) ⇌ CH₃COOC₂H₅(l) + H₂O(l)

• Δng: All reactants and products are in the liquid phase. Δng = 0.
• Kp Definition: Kp is not defined for reactions involving only liquids and solids; it is defined for gaseous reactions.

Final Matching

A: Q, S

B: P

C: P

D: R

Final Answer

A-QS, B-P, C-P, D-R