Sublimation

Author:Dr. Pankaj Rai
9th CBSE
IMPORTANT

Sublimation: Overview

This topic sheds light on the process of sublimation. It defines the terms sublime and sublimates. With the help of an experiment, it demonstrates the process of sublimation of ammonium chloride. We will also study some of the applications of sublimation.

Important Questions on Sublimation

MEDIUM
IMPORTANT

There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

What is the name of substance C ?

MEDIUM
IMPORTANT

There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

Out of W, X, Y and Z, which substance/substances can undergo sublimation ?

HARD
IMPORTANT

With the help of a well-labelled diagram (with two labelling) explain how solid ammonium chloride converts directly to gaseous state on heating?  

Question Image

HARD
IMPORTANT

Describe the process of sublimation by taking the example of ammonium chloride.

EASY
IMPORTANT

Explain, why naphthalene balls kept in stored clothes in our homes disappear over a period of time?

MEDIUM
IMPORTANT

Give one use of dry ice.

EASY
IMPORTANT

What is the common name of solid carbon dioxide?

EASY
IMPORTANT

Is dry ice the same thing as ordinary ice?

MEDIUM
IMPORTANT

Name the process due to which dry ice changes into carbon dioxide gas.

EASY
IMPORTANT

What is the name of the process in which: a gas changes directly into a solid?

EASY
IMPORTANT

What is the name of the process in which: a solid change directly into a gas?

EASY
IMPORTANT

What is sublimation? Name two substances that undergo sublimation.

EASY
IMPORTANT

Name a suitable technique to separate sand from ammonium chloride.