Crystallisation is a method of purification of sugar.

Important Questions on Elements, Compounds and Mixtures

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 6

Salt and water form a homogeneous mixture.

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 7

On filtering a solution, the part collected on the filter paper is called filtrate.

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 8

Centrifugation process is used for separating cream from the milk.

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 10

Ammonium chloride sublimes on heating.

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 1

What are pure substances? Give two examples of pure substances.

MEDIUM

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 2

Which of the following are ‘pure substances’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air

EASY

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 6

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

MEDIUM

8th ICSE

IMPORTANT

Lakhmir Singh's Science - Chemistry>Chapter 3 - Elements, Compounds and Mixtures>EXERCISES>Q 7

What is the difference between threshing and winnowing?