Question

The liquid which has the highest rate of evaporation is____?

• A. Petrol
• B. Honey
• C. Water
• D. Alcohol

Answer 1

The correct option is A

Petrol

Explanation for the correct option

(A) Petrol

Evaporation

A process where liquid changes into a gas below its boiling point is called as evaporation. While evaporating liquids molecules absorb energy from the surrounding, with increase in kinetic energy they escape from the surface. Evaporation of a liquid depends upon several factors.

• Inter-molecular force- Rate of evaporation is fast for liquids with weaker inter-molecular forces.
• Temperature : Higher temperature in the surrounding promotes the rate of evaporation by increasing kinetic energy of molecules.
• Surface Area : Surface area directly impacts the rate of evaporation because higher the surface area more molecules escape to the surroundings.
• Composition of environment like humidity and lower wind speed decrease rate of evaporation.

Option A - Petrol is correct. Boiling point of petrol is much lower than water, honey and alcohol.

Hence, the correct option is (A).

Explanation for the incorrect options

(B) Honey has many components in it out of only moisture content evaporates over the time, remaining components crystallize.

(C) Water has high boiling point, that is ${100}^{\circ }\mathrm{C}$.

(D) Alcohol does not evaporate at room temperature. it has boiling point of ${78}^{\circ }\mathrm{C}$.

Hence, the correct option is (A), Petrol.