Chemistry Quiz on Pure Substances

Name the technique is ____________ which is used to separate different pigments from a colour.

Give two examples of metalloids.

What do you mean by a pure substance?

Identify the solution from the following –

• Air

• Sea water

• Coal

• Ice

Which of the following will show “Tyndall Effect”?

• Salt solution

• Water

• Air

• Milk

Identify the following as physical and chemical changes –

(a) Rusting of iron                                       (b) Freezing of water

 (c) Mixing of sugar and sand                    (d) Digestion of food

Write two applications of centrifugation technique.

A solution contains 50g of salt in 400g of water. Calculate the concentration of solution in terms of mass by mass percentage of the solution.

Write three differences between a compound and a mixture.

How will you separate a mixture of salt and ammonium chloride. Explain with the help of diagram.