OAU Chemistry 2019/2020 Past Questions

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

Which of the following would you use as an indicator in titration of sodium carbonate against hydrocloric acid for a complete neutralization

A.methyl orange
B.litmus
C.phenolphthalein
D.any indicator

2SO₂ + O₂ → 2SO₂. In the equation above, the substance that will increase the rate of production os sulphur(vi)oxide is

A.nickel
B.vanadium(v)oxide
C.finely divided iron
D.manganese(iv)oxide

Which of the following types of bonding does not involve the formation of new substance?

A.metallic
B.covalent
C.coordinate
D.electrovalent

In the equation m = ZQ.Z represents

A.gravitational constant
B.partial constant
C.electrode constant
D.electrochemical equivalent

........ is often used for vulcanization of rubber

A.chlorine
B.hydrogen peroxide
C.sulphur
D.H₂SO₄

Deliquescent substances are used for

A.cooling
B.wetting
C.melting
D.drying

When a solid changes into gaseous form, without passing through lliquid state, it is said to have undergone

A.sublimation
B.evaporation
C.crystallization
D.distillation

Which of the following is used as a ripening agent for fruits?

A.methane
B.propene
C.ethane
D.butane

The oxides that will react further with oxygen to form higher oxides are

A.CO₂ and H₂O
B.NO and H₂O
C.SO₂ and NO
D.CO and CO₂

Determine the molar mass of a compound, if 0.4 mole of it has a mass of 40g

A.160 g/mol
B.100 g/mol
C.1.6 g/mol
D.0.01 g/mol