IMSU Chemistry 2020/2021 Model Past Questions

Practice each question, then open it to see the full details.

An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolation of the dyes?

A.Fractional distillation
B.Paper chromatography
C.Coagulation
D.Recrystallization

The component of air that is removed when air is bubbled into alkaline pyrogallol solution is.......

A.Carbon (IV) Oxide
B.Oxygen
C.Water vapour
D.Nitrogen
E.Helium

Cotton is almost pure

A.starch
B.protein
C.animal fibre
D.cellulose

Lucas reagent is used to test for

A.alkanes
B.alkanoic acids
C.alkanols
D.amines

Which of the following halogens is the most reactive?

A.F₂
B.Br₂
C.Cl₂
D.I₂