Equilibrium NDA Questions

NDA Chemistry

Equilibrium MCQ Questions


13.
For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), the correct expression for Kc is:
A.
Kc = [N2][H2]^3 / [NH3]^2
B.
Kc = [NH3]^2 / [N2][H2]^3
C.
Kc = [NH3] / [N2][H2]
D.
Kc = [N2]^1[H2]^3 / [NH3]
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ANSWER :
B. Kc = [NH3]^2 / [N2][H2]^3
14.
For gaseous equilibria, the equilibrium constant expressed in terms of partial pressures of reactants and products is denoted by:
A.
Kb
B.
Kc
C.
Ka
D.
Kp
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ANSWER :
D. Kp
15.
The relationship between Kp and Kc for a gaseous reaction at temperature T is given by:
A.
Kp = Kc + RT
B.
Kp = Kc/RT
C.
Kp = Kc(RT)^Δn
D.
Kp = Kc - Δn(RT)
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ANSWER :
C. Kp = Kc(RT)^Δn
16.
In the relation Kp = Kc(RT)^Δn, the term Δn represents:
A.
The change in temperature during the reaction
B.
The degree of dissociation of the reactants
C.
The difference between the number of moles of gaseous products and gaseous reactants
D.
The total number of moles of reactants only
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ANSWER :
C. The difference between the number of moles of gaseous products and gaseous reactants
17.
For the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), the value of Δn (used to relate Kp and Kc) is:
A.
+1
B.
0
C.
-1
D.
+2
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ANSWER :
A. +1
18.
Which of the following statements correctly describes the equilibrium constant K?
A.
K has no relation to temperature
B.
K always increases as the reaction proceeds towards equilibrium
C.
K is constant at a given temperature and is independent of the initial concentrations
D.
K depends on the initial concentrations of reactants and products
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ANSWER :
C. K is constant at a given temperature and is independent of the initial concentrations