Surface Chemist...

Freshly prepared precipitate sometimes gets converted to colloidal solution by:

In which of the following reactions heterogeneous catalysis is involved?
(I) $$2SO_{2}$$ + $$O_{2}$$   $$\overset{V_{2}O_{5}}{\longrightarrow}$$   $$2SO_{3}$$
(II) $$2SO_{2}$$ + $$O_{2}$$   $$\overset{NO_{(g)}}{\longrightarrow}$$   $$2SO_{3}$$
(III) $$2N_{2} + 3H_{2}$$   $$\overset{Fe}{\longrightarrow}$$   $$2NH_{3}$$
(IV) $$CH_{3}COOCH_{3}$$ + $$H_{2}O$$   $$\overset{HCl_{(aq)}}{\longrightarrow}$$   $$CH_{3}COOH$$ + $$CH_{3}OH$$

The role of a catalyst is to change _______.

Which of the following phenomenon is applicable to the process shown in the figure?

In the presence of a catalyst, the heat evolved or absorbed during the reaction:

Which of the following is an example of absorption?

Which of the following will form a reversible sol?

Entropy change $$(\Delta S)$$ for adsorption:

Alcohols can be converted to various types of gasoline(period) by shape-selective catalyst.

Which of the following gases can be adsorbed in more proportion?