The variation of the rate of an enzyme-catalyzed reaction with substrate concentration is correctly represented by which graph?

Match List-$I$ with List-$II$.

List-$I$ (Processes/Reactions)	List-$II$ (Catalyst)
$A. 2 SO_{2(g)} + O_{2(g)} \rightarrow 2 SO_{3(g)}$	$I. V_{2}O_{5}$
$B. 4 NH_{3(g)} + 5 O_{2(g)} \rightarrow 4 NO_{(g)} + 6 H_{2}O_{(g)}$	$II. Pt_{(s)}-Rh_{(s)}$
$C. N_{2(g)} + 3 H_{2(g)} \rightarrow 2 NH_{3(g)}$	$III. Fe_{(s)}$
$D. \text{Vegetable oil}(l) + H_{2} \rightarrow \text{Vegetable ghee}(s)$	$IV. Ni_{(s)}$

Choose the correct answer from the options given below.

Which of the following statements is most accurate regarding a catalyst?

The efficiency of a catalyst depends on which of the following?

Which of the following is an example of homogeneous catalysis?

In aqueous solution,$Na_2SO_3$ is oxidized by air,but $Na_3AsO_3$ is not. However,when air is passed through a solution containing both $Na_2SO_3$ and $Na_3AsO_3$,both are oxidized. This is an example of: