Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumProblems involving more than one equilibriumMedium2 minQB
ChemistryMediummultiple choice
The equilibrium between gaseous isomers A, B and C can be represented as:
A(g) ⇌ B(g); K1 = ?
B(g) ⇌ C(g); K2 = 0.4
C(g) ⇌ A(g); K3 = 0.5
If 3 moles of A are taken in a closed vessel of volume 3 L, then
Options:(select one or more)
Answer:
B, D
Solution:
The three steps form a closed cycle, so K1K2K3 = 1 K1 = 1/(0.4 × 0.5) = 5, so (c) is wrong
The starting concentration is 3 mol/3 L = 1 M and the isomers only interconvert, so [A] + [B] + [C] = 1 M at any moment and (a) is wrong
[B] = K1[A] = 5[A] and [C] = K2[B] = 2[A]
[A](1 + 5 + 2) = 1, so [A] = 0.125 M, [B] = 0.625 M, [C] = 0.25 M, so (b) is correct
B has the largest equilibrium concentration, so it is the most stable isomer, so (d) is correct
The correct statements are (b) and (d).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Problems involving more than one equilibrium
⏱ 2mℹ️ Source: QB
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