Consider the following statements about Sublimation: 1. It is the change of gaseous state directly to liquid state. 2. Camphor and Ammonium chloride undergo sublimation. 3. The direct change of gas to solid is called Deposition. Which of the statements given above is/are correct?

The correct option is (c) 2 and 3 only. Explanation Matter exists in three primary states: solid, liquid, and gas. Phase transitions occur when matter changes from one state to another due to changes in temperature or pressure. Sublimation and deposition are specific transitions that bypass the liquid phase. Statement-wise Analysis: - Statement 1 is Incorrect. Sublimation is the change of state directly from solid to gas without changing into the liquid state. The change of gaseous state to liquid state is known as condensation. - Statement 2 is Correct. Certain substances have weak intermolecular forces that allow them to transition directly from solid to gas upon heating. Common examples include camphor, ammonium chloride, naphthalene, and anthracene. - Statement 3 is Correct. The direct change of gas to solid without changing into liquid is called deposition (also known as desublimation). An example of this is the formation of frost on a cold surface. Key Takeaway: Sublimation is the direct transition from Solid → Gas (e.g., Dry Ice, Camphor). Deposition is the direct transition from Gas → Solid (e.g., Frost).

NCERT Class 9 Science — Chapter 1: Matter in our surroundings

mcqmedium

Consider the following statements about Sublimation:

It is the change of gaseous state directly to liquid state.
Camphor and Ammonium chloride undergo sublimation.
The direct change of gas to solid is called Deposition.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c) 2 and 3 only.

Explanation

Matter exists in three primary states: solid, liquid, and gas. Phase transitions occur when matter changes from one state to another due to changes in temperature or pressure. Sublimation and deposition are specific transitions that bypass the liquid phase.

Statement-wise Analysis:

Statement 1 is Incorrect. Sublimation is the change of state directly from solid to gas without changing into the liquid state. The change of gaseous state to liquid state is known as condensation.
Statement 2 is Correct. Certain substances have weak intermolecular forces that allow them to transition directly from solid to gas upon heating. Common examples include camphor, ammonium chloride, naphthalene, and anthracene.
Statement 3 is Correct. The direct change of gas to solid without changing into liquid is called deposition (also known as desublimation). An example of this is the formation of frost on a cold surface.

Key Takeaway:
Sublimation is the direct transition from Solid → Gas (e.g., Dry Ice, Camphor). Deposition is the direct transition from Gas → Solid (e.g., Frost).

Your note

More from Chapter 1: Matter in our surroundings

What causes the formation of water droplets on the outer surface of a glass containing ice-cold water?

easy

Consider the following statements: 1. Matter is defined as anything that has mass but does not occupy space. 2. The smell of perfume is matter, but the feeling of love is not. 3. Air is not considered matter because it cannot be seen. Which of the statements given above is/are correct?

easy

With reference to the process of 'diffusion', consider the following statements: 1. Diffusion requires external mechanical force to intermix particles. 2. The rate of diffusion increases with an increase in temperature. 3. Solids and liquids can diffuse into liquids. Which of the statements given above is/are correct?

medium

Consider the following statements regarding the forces of attraction between particles of matter: 1. The force of attraction is strongest in gases and weakest in solids. 2. This force keeps the particles together. 3. The strength of this force is identical for all kinds of matter. Which of the statements given above is/are correct?

easy

The spontaneous spreading of potassium permanganate colour in water without stirring primarily demonstrates which property of matter?

medium

Keep practising Chapter 1: Matter in our surroundings

Work through every question from this NCERT chapter.

Browse all NCERT Class 9 Science chapters

The correct option is (c) 2 and 3 only.

Explanation

Statement-wise Analysis:

Statement 1 is Incorrect. Sublimation is the change of state directly from solid to gas without changing into the liquid state. The change of gaseous state to liquid state is known as condensation.
Statement 2 is Correct. Certain substances have weak intermolecular forces that allow them to transition directly from solid to gas upon heating. Common examples include camphor, ammonium chloride, naphthalene, and anthracene.
Statement 3 is Correct. The direct change of gas to solid without changing into liquid is called deposition (also known as desublimation). An example of this is the formation of frost on a cold surface.

Key Takeaway:
Sublimation is the direct transition from Solid → Gas (e.g., Dry Ice, Camphor). Deposition is the direct transition from Gas → Solid (e.g., Frost).