Equilibrium Involving Chemical Processes (Law of Chemical Equilibrium, Equilibrium Constants,...) NEET Questions

Physical Chemistry - Equilibrium

Equilibrium Involving Chemical Processes (Law of Chemical Equilibrium, Equilibrium Constants,...) MCQ Questions


1.
The law of chemical equilibrium (law of mass action) was proposed by:
A.
Guldberg and Waage in 1864
B.
Arrhenius
C.
Le Chatelier
D.
Van't Hoff
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ANSWER :
A. Guldberg and Waage in 1864
2.
For the general reaction aA + bB ⇌ cC + dD at equilibrium, the equilibrium constant Kc is given by:
A.
[A]^a[B]^b / [C]^c[D]^d
B.
[C]^c[D]^d / [A]^a[B]^b
C.
[A]+[B] / [C]+[D]
D.
([A][B]) / ([C][D])
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ANSWER :
B. [C]^c[D]^d / [A]^a[B]^b
3.
The 'active mass' in the law of mass action refers to:
A.
Molar concentration (or partial pressure for gases)
B.
Mass of catalyst
C.
Atomic mass
D.
Total mass of the substance
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ANSWER :
A. Molar concentration (or partial pressure for gases)
4.
The equilibrium constant for the reaction 4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) is:
A.
[NH3]^4[O2]^5 / [NO]^4[H2O]^6
B.
[NO][H2O] / [NH3][O2]
C.
[NO]^4 + [H2O]^6 / [NH3]^4 + [O2]^5
D.
[NO]^4[H2O]^6 / [NH3]^4[O2]^5
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ANSWER :
D. [NO]^4[H2O]^6 / [NH3]^4[O2]^5
5.
The value of equilibrium constant Kc depends on:
A.
Presence of catalyst
B.
Temperature only
C.
Initial concentrations of reactants
D.
Pressure
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ANSWER :
B. Temperature only
6.
If the equilibrium constant for the forward reaction A ⇌ B is K, the equilibrium constant for the reverse reaction B ⇌ A is:
A.
K
B.
K²
C.
1/K
D.
√K
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ANSWER :
C. 1/K