Is the matter around us pure? Part 2

Which of the following is not an emulsion?

• milk

• butter

• face cream

• shaving cream

Which of the following is not a chemical change?

• formation of curd

• ripening of banana

• sublimation of napthalene

• corrosion of photo frame

A mixture of milk and groundnut oil can be separated by

• sublimation

• evaporation

• separating funnel

• filtration

Which of the following mixtures cannot be separated by using water as the solvent?

• copper sulphate and sand

• sand and potash alum

• sand and sulphur

• sugar and sand

The dye present in the fountain pen ink can be separated by the technique of:

• Fractional distillation

• infrared photography

• crystallization

• chromatography

Pure copper sulphate can be obtained from an impure sample by the process of

• evaporation

• fractional distillation

• centrifugation

• crystallization

The material which is added to water during the purification process at the waterworks so as to disinfect it is:

• potassium permaganate

• betadine

• chlorine

• potash alum

Naphthalene can be separated from sand:

• by sublimation

• by distillation

• by crystallization

• by using water as a solvent

The correct increasing order of the boiling points of liquid oxygen, liquid, argon and liquid nitrogen present in liquid air is:

• nitrogen, oxygen argon

• nitrogen argon oxygen

• argon oxygen nitrogen

• oxygen argon nitrogen

The boiling point of argon is:

• -196 degree Celcius

• -183 degree Celcius

• -186 degree Celcius

• -193 degree Celcius