ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Give a reason for the following statement:

Evaporation of a common salt solution or seawater leaves behind common salt inside the evaporating dish after heating.

Define :- Distillation 

How is distillation more advantageous than evaporation?

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Fractional distillation :

Give one word answer

The liquid which evaporates and then condenses during the process of distillation 

Give one word answer

The process by which two miscible liquids are separated

Select the correct alternative from the choices given for the following statement:

Components of crude petroleum can be separated by

State the correct technique for the separation of the following mixture.

a low boiling point liquid from a high boiling point liquid.

Pure water from impure water

• Give the principle involved in the separation of the mixture
• Give the technique of separation of the mixture.

Methyl alcohol and water

• Give the principle involved in the separation of the mixture
• Give the technique of separation of the mixture.

Tick the most appropriate answer

Fractional distillation is used to separate liquids having an appreciable difference in their ______________.

What is chromatography?

What are the advantages of chromatography?

Name the simplest type of chromatography?

On what principle is Chromatography method based?

What is meant by stationary phase and mobile phase in chromatography?

Select the correct alternative from the choices given for the following statement:

In chromatography the filter paper is 

Name the different types of chromatographic techniques.

State the correct technique for the separation of the following mixture.

solid constituents in a liquid constituent by adsorption.

Dyes of an ink

• Give the principle involved in the separation of the mixture
• Give the technique of separation of the mixture.