OAU Chemistry 2022/2023 Past Questions

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

the preparation of ethoxyethane (C₂H₅OC₂H₅) form ethanol can be considered as

A.dehydration
B.oxidation reactions
C.hydrolysis reactions
D.dehydrogenation reactions

which of the following gives the correct formula of the fatty acid present in palm oil?

A.CH₃(CH₂)₁₄COOH
B.CH₃(CH₂)₁₆COOH
C.CH₃(CH₂)₁₅COOH
D.CH₃(CH₂)₁₇COOH

glycerol had the typical properties of

A.an acid
B.a base
C.an alcohol
D.an ester

a certain natural product contains the ester glycerol palmitate.
soap can be made from this by

A.passing over activated coal
B.boiling with sodium hydroxide
C.mixing with hydrogen
D.heating with glycerine

The properties of electrovalent compounds include the following except

A.high melting point and boiling point
B.conduction of electricity in the molten state
C.high vitality at room temperature
D.ionization in aqueous solution
E.decomposition of their solution by electric current

Which of the following statements is not correct about electrolysis?

A.reduction occurs at the anode
B.anions migrate to the anode
C.positive ions migrate to the cathode
D.concentration effects the discharge of ions

Separation of mixtures of solids by physical methods can be based on differences in the following except

A.melting point
B.solubility
C.particle size
D.molar mass

The following are major gaseous pollutants except

A.CO
B.CO₂
C.SO₂
D.CFC

A mixture of iron and sulphur can be separated by dissolving the mixture in ..........

A.steam
B.dilute hydrochloric acid
C.dilute sodium hydroxide
D.benzene

A mixture of sand, ammonium chloride and sodium chloride is best separated by ..........

A.sublimation followed by addition of water and filtration
B.sublimation followed by addition of water and evaporation
C.addition of water followed by filtration and sublimation
D.addition of water followed by crystallization and sublimation