Write the equilibrium constant expressions for the following reactions :
(a) `BaCO_3(s) hArr BaO(s) + CO_2(g)`
(b) `AgBr(s) hArr Ag^(+)(aq)+Br^(-)(aq)`
(c) `CH_3COCH_3(l) hArr CH_3COCH_3(g)`
(d) `CH_4(g) + 2O_2(g) hArr CO_2(g) +2H_2O(l) `
(e) `Al(s)+3H^(+)(aq) hArr Al^(3+)(aq)+3//2H_2(g)`
(f) `HPO_4^(2-)(aq)+H_2O hArr H_3O^(+)(aq)+PO_4^(3-)`(aq)

Explanation

To write the equilibrium constant expressions for the given reactions, we will follow the general formula for equilibrium constants, which is:

\[ K = \frac{[\text{Products}]^{\text{coefficients}}}{[\text{Reactants}]^{\text{coefficients}}} \]

Where:
- Square brackets \([\ ]\) denote the concentration of species in mol/L (for \(K_c\)) or the partial pressure (for \(K_p\)).
- Pure solids and pure liquids are not included in the equilibrium expression as their activities are considered to be 1.

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