Which one of the following may be termed as pure substance?

1

(a)

Sodium chloride

(b)

Soft drink

(c)

Aerosol

(d)

Soil

select a heterogeneous mixture of the following:

1

(a)

Air

(b)

NaCL in water

(c)

Emulsion

(d)

Alloy

Select a compound out of the following:

1

(a)

Air 

(b)

Solution

(c)

marble

(d)

Stainless steel

A mixture of ammonium chloride and sand can be separated by

1

(a)

decantation

(b)

centrifugation

(c)

sublimation

(d)

evaporation

Take 5gm each of iron filings and sulphur in a china dish, state which activity gives a compound.

1

(a)

Mix and crush the mixture

(b)

Add carbon disulphide, stir well and filter

(c)

Heat strongly till red hot while mixing

(d)

Separate iron filings with the help of a magnet

Cloud is an example of ___________

1

(a)

solid dispersed in a gas

(b)

liquid dispersed in a gas

(c)

liquid dispersed in a solid

(d)

solid dispersed in a gas

Components retain their properties in a................

1

(a)

mixture

A solution is a ...............mixture of two or more substances.

1

(a)

homogeneous

When no more solute can be dissolved in a solution at a given temperature, it is called a .................... solution

1

(a)

saturated

The particles of a .................. solution shows Tyndall effect.

1

(a)

colloidal

The solvent used to prepare colloidal solution shows Tyndall effect ___________

1

(a)

dispersing

Emulsion is a colloidal solution of liquid in .................

1

(a)

liquid

Cream is separated solution of liquid in ...................

1

(a)

centrifugation