#### What is the equilibrium expression for the reaction Option 1)       Option 2) Option 3) Option 4)

As we learnt in

Law of Chemical equilibrium -

At a given temperature, the product of concentration of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentration of the reactants raised to their individual stoichiometric coefficients has a constant value.

- wherein

are equilibrium concentration

We know that concentration of a solid component is always taken as unity.

Option 1)

This option is incorrect

Option 2)

This option is incorrect

Option 3)

This option is incorrect

Option 4)

This option is correct