The thermal dissociation equilibrium of `CaCO_(3)(s)` is strudied under different conditions
`CaCO_(3)(s)hArrCaO(s)+CO_(2)(g)`
For this equilibrium, the correct statements are
(i) K is dependent on the pressure of `CO_(2)` at a given T.
(ii) `Delta H` is dependent on T.
(iii) `Delta H` is independent of the catalyst, if any.
(iv) K is independent of the inintial amount of `CaCO_(3)`.

Options

A. (i), (ii), (iii), (iv)
B. (i), (ii), (iii)
C. (ii), (iii), (iv)
D. (i), (ii), (iv)

Answer

C

Explanation

`CaCO_(3)(s)hArrCaO(s)+CO_(2)(g)`
Since `CaCO_(3)` and `CaO` are pure solids, we have `K_(eq)=[CO_(2)]`
Thus, the equilibrium constant (K) is dependent on the pressure of `CO_(2)` at a given T but is independent of the intial amount of K. `Delta H` does not depend on catalyst but depends on temperature.