English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

State three reasons why you think air is a mixture and water is a compound.

Compare the properties of metals and non-metals with respect to

1. alleability
2. ductility
3. electrical conductivity.

Choose the solutions from among the following mixtures :

Soil, Sea-water, Air, Coal, Soda-water

Is air a mixture or a compound ? Give three reasons for your answer.

Give two reasons for supposing that water is a compound and not a mixture.

Define a mixture. Give two points of evidence to show that sugar solution is a mixture.

List five characteristics by which compounds can be distinguished form mixtures.

Explain why, a solution of salt in water is considered a mixture and not a compound.

The value of acceleration due to gravity of earth :

State the main points of difference between homogeneous and heterogeneous mixtures.

Classify the following materials as homogeneous mixtures and heterogeneous mixtures :

Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.

What is a mixture ? Give two example of mixtures.

What is meant by (i) homogeneous mixtures, and (ii) heterogeneous mixtures ? Give two examples of homogeneous mixtures and two of heterogenous mixtures.

Which of the following is not a mixture ?

When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is :

Which of the following are homogeneous in nature ?

1. ice
2. wood
3. soil
4. air

The ‘sea water’ can be classified as a homogeneous mixture as well as a heterogeneous mixture ? Comment.

Which one of the following is most likely to exhibit Tyndall effect ?

A mixture of sulphur and carbon disulphide is :

Many indigestion mixtures are suspensions. What do the instructions written on the bottle of an indigestion mixture tell us before taking the mixture, and why ?