In which of the following cases does the reaction go farthest to completion?

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

Among the following,the correct statement about the chemical equilibrium is

One mole of $A_{(g)}$ is heated to $200^{\circ} C$ in a one litre closed flask,until the following equilibrium is reached:
$A_{(g)} \rightleftharpoons B_{(g)}$
The rate of forward reaction at equilibrium is $0.02 \ mol \ L^{-1} \ min^{-1}$. What is the rate (in $mol \ L^{-1} \ min^{-1}$) of the backward reaction at equilibrium?

Addition of a catalyst in a system at equilibrium:

Which one of the following statements is correct?