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Chemical Equilibrium
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Law of mass action, Kc and Kp
NEET level
Single correct option
Difficulty 1 of 3
ce002
For the equilibrium
CaCO
X
3
(
s
)
CaO
(
s
)
+
CO
X
2
(
g
)
, the correct expression for
K
c
is
A
K
c
=
[
CO
X
2
]
B
K
c
=
[
CaCO
X
3
]
[
CaO
]
[
CO
X
2
]
C
K
c
=
[
CaO
]
[
CO
X
2
]
[
CaCO
X
3
]
D
K
c
=
[
CO
X
2
]
1
Answer: A
The activity (effective concentration) of a pure solid is constant and is taken as 1. Only the gas
CO
X
2
appears in the expression, so
K
c
=
[
CO
X
2
]
.
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