1.

For the equilibrium `MgCO_3(g)oversetDeltahArrMgO(s)CO_2(s)` which of the following expressions is correct ?A. `K_p=pco_2`B. `K_p=([MgO][CO_2])/([MgCO_3])`C. `K_p=(p_(Mgo).p_(CO_2))/(p_(MgCO_3))`D. `K_p=(p_(Mgo)+p_(CO_2))/(p_(MgCO_3))`

Answer» Correct Answer - A
In hetrogeneous system. `K_(c)and K_(p)` are not depend upon the concentration of pressure of solid substence Hence. At equilibrium their concentratiaon or pressure are assumed as one.
`MgCO_3(s)hArrMgO(s)+CO_2(g)`
`therefore K_p=Pco_(2)`


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