UNICAL Chemistry 2020/2021 Past Questions

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

Starch can be converted to ethyl alcohol by

A.distillation
B.fermentation
C.isomerization
D.cracking

Which of the following features of a human skeleton can be determined by carbon dating?

A. Height
B. Mass
C. Age
D. Race

The volume of 2.5 moles of oxygen at S.T.P is

A. 56.0dm³
B. 84.0dm³
C. 50.0dm³
D. 28.0dm³

Which of the following indicates the correct oxidizing power of the halogens

A. F> Cl> Br> I
B. I> Br> Cl> F
C. I> Cl> Br> F
D. Br> I> Cl> F

Which of the following exhibits resonance

A. Benzene
B. Butane
C. Pentane
D. Octane

An alkene may be converted to alkane by

A.Halogenation
B. Hydrogenation
C. Dehydration
D. Hydrolysis

If both the pressure and volume of a given mass of gas initially at 0°C are doubled, what is the final temperature?

A.546K
B.1092K
C.100K
D.273K

Aluminium is a good roofing material because it

A.is malleable and ductile and can be drawn into sheets
B.forms an oxide film over its surface which prevents corrosion
C.is strong and does not conduct heat and electricity
D.reflects light due to its lustre.

Which of the following is an example of a chemical change?

A.freezing of water
B.dissolution of NaCl
C.rusting of iron
D.seperation a liquid mixture by distillation

What properties of Duralumin makes it more useful than its constituent metals?

A.it is heavy with a high melting point
B.it is malleable and has high density
C.it is strong and light
D.it is hard and ductile