Which statement for the equilibrium constant is true for the reaction $A + B \rightleftharpoons C$?

At what change in Gibbs free energy $(\Delta G)$ does a reaction reach equilibrium?

Which one of the following statements is correct?

Describe the method for measuring the equilibrium vapour pressure of water at a constant temperature.

Select the incorrect statement $(s)$ regarding the state of equilibrium.

For the reaction $A + B \rightleftharpoons C + D$,the equilibrium constant is $K$. If the initial moles of $A$ and $B$ are $1.0 \ mol$ each,what will be the value of the equilibrium constant in a second experiment under the same conditions if the initial moles of $A$ and $B$ are $2 \ mol$ and $3 \ mol$ respectively?