$A$ negative catalyst .......

Which statement is incorrect for a catalyst?

In which one of the following processes do the reactants and catalyst exist in three different states?

When $KMnO_4$ solution is added to hot oxalic acid solution,the decolourisation is slow in the beginning but becomes instantaneous after sometime. This is because

The catalyst and promoter respectively used in the Haber's process of industrial synthesis of ammonia are

Match the catalyst (Column-$I$) with products (Column-$II$)

Column-$I$ Catalyst	Column-$II$ Product
$(a)$ $V_2O_5$	$(i)$ Polyethylene
$(b)$ $TiCl_4/Al(Me)_3$	$(ii)$ Ethanal
$(c)$ $PdCl_2$	$(iii)$ $H_2SO_4$
$(d)$ Iron oxide	$(iv)$ $NH_3$