Question

Sublimation of any substance is

• A. Physical change
• B. chemical change
• C. Both
• D. All of these

Answer 1

The correct option is A

Physical change

Explanation for the correct option:-

(A) Physical change:- A change that alters some specific property of matter without any change in the composition of its molecules is called a physical change.

• Sublimation: The process of converting a solid to a gaseous state without it becoming liquid.
• The evaporation of frozen carbon dioxide (dry ice) under normal atmospheric pressure and temperature is one example. The phenomenon is caused by the interaction of vapour pressure and temperature.
• Sublimation process in which change of sate takes place in physical properties

Explanation for the incorrect option:-

(B) Chemical change:- A change that alters the specific properties of a substance by bringing about a change in its molecular composition, followed by a change in its state, is called a chemical change.

• New substances with entirely new properties are formed.
• A chemical change cannot be easily reversed.
• There is usually a change in weight during a chemical reaction.
• A lot of heat is usually given off or absorbed during a chemical change.

Conclusion: Hence option (A) is correct.