Question

Match the item of column I to column II.

Column 1	Column 2
Cooling the molten iron	Melting
Camphor (s)$\to$Camphor (g)	Vaporisation
Dry air $\to$ Liquid air	Liquefaction
Sodium(s) $\to$Sodium(l)	Freezing
Ethanol to ethanol vapour	Sublimation

Answer 1

(A) Cooling the molten iron - (iv) Freezing

The process of cooling of molten iron is called freezing.

(B) Camphor (s)$\to$Camphor (g) - (v) Sublimation

The process of changing solid into vapour without changing into a liquid state is called sublimation.

(C) Dry air $\to$ Liquid air - (iii) Liquefaction

The phase transitions from solid and gas to liquid (melting and condensation, respectively) may be referred to as liquefaction.

(D) Sodium(s) $\to$Sodium(l) - (i) Melting

Solid sodium changes into a liquid state while changing in temperature, this process is called melting.

(E) Ethanol to ethanol vapour - (ii) Vaporisation

Ethanol boils at 78.4 $°\mathrm{C}$ and the standard enthalpy of vaporization of ethanol is 42.4 kJ mol^-1

Column-I	Column -II
(A) Cooling the molten iron	(iv) Freezing
(B) Camphor (s)$\to$Camphor (g)	(v)Sublimation
(C) Dry air $\to$ Liquid air	(iii) Liquefaction
(C) Sodium(s) $\to$Sodium(l)	(i) Melting
(D) Ethanol to ethanol vapour	(ii) Vaporisation