Question

Identify the correct statements from the following:
I) In adsorption process, both enthalpy and entropy decrease.
II) In general, physisorption is an irreversible process.
III) The catalyst used in the decomposition of potassium chlorate is manganese dioxide.

• A. I, II, III
• B. I, II only
• C. I, III only
• D. II, III only

Hint:

Catalysts do not alter equilibrium, only the rate. Physisorption is generally reversible.

Answer 1

The Correct Option is C

In adsorption, the process is exothermic and leads to decreased entropy (randomness). 
Manganese dioxide is used as catalyst in decomposition of KClO$_3$. However, physisorption is usually reversible, not irreversible.