Question

The purification method based on the following physical transformation is: \[ {Solid} \xrightarrow{{Heat}} {Vapour} \xrightarrow{{Cool}} {Solid} \]

• A. Distillation
• B. Sublimation
• C. Crystallization
• D. Extraction

Hint:

Sublimation is a useful technique for purifying solids that can transition directly from the solid phase to the gas phase without passing through the liquid phase.

Answer 1

The Correct Option is B

The given physical transformation describes a purification method where a solid is converted to vapor through the application of heat and then back to solid upon cooling. The process involving this sequence of phase changes is known as sublimation.

Explanation: Sublimation is a technique used to purify substances that can transition from solid to vapor without passing through a liquid phase. When the solid substance is heated, it turns into vapor. Upon cooling, this vapor directly condenses back into a solid form. This method is effective for separating sublimable compounds from non-sublimable impurities.

The correct answer is Sublimation.