In which of the following cases does the reaction proceed towards completion?

In the chemical equilibrium of a reversible reaction,which of the following does not cause any change?

For the reaction $H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}$,the equilibrium constant is $64$. If the volume of the container is reduced to $1/4$ of its original value,the value of the equilibrium constant will be .......

The $K_c$ for $H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}$ is $64$. If the volume of the container is reduced to one-half of its original volume,the value of the equilibrium constant will be

Explain chemical equilibrium by giving an example of a general reaction.

Explain the dynamic nature of chemical equilibrium with a suitable reaction example.