UNIPORT Chemistry 2013/2014 Past Questions

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

A certain volume of gas at 298k is heated such that its volume and pressure are now four times the original values. What is the temperature?

A.18.9k
B.100.0k
C.298.0k
D.1192.0k
E.4768.0k

The boiling points of water, ethanol, toluene and buthan-2-ol are 373.0k, 352.3k, 383.6k and 372.5k respectively, which liquid has the highest vapour pressure at 323.ok?

A.water
B.toluene
C.ethanol
D.dutan-2-ol
E.none

The function of sulphur during the vulcanization of rubber is to

A.act as catalyst for the polymerization of rubber molecules
B.convert rubber from thermosetting to thermoplastic polymer
C.from chain which bind rubber molecules together
D.break down rubber polymer molecule
E.shorten the chain length of rubber polymer

Complete hydrogenation of ethyne yields

A.benzene
B.methane
C.ethane
D.ethane
E.propane

Mixing of aqueous solution of barium hydroxide and sodium tetraoxocarbonate(iv) yields a white precipitate of

A.barium oxide
B.sodium tetraoxocarbonate
C.sodium oxidesodium hydroxide
D.barium tetraoxocarbonate

An organic compound decolorized acidified lcnc4solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be

A.a carboxylic acid
B.an alkane
C.an alkene
D.an alkyne
E.an alkkanone

Which of the following conducts electricity

A.sulphur
B.graphite
C.diamond
D.red phosphorus
E.yellow phosphorus

Which of the following compounds is not the correct product formed when the parent metal is heated in air?

A.Calcium oxide (CaO)
B.sodium oxide (NA₂O)
C.copper(ii)oxide(CuO)
D.tri-form tetroxide(Fe₃O)
E.aluminium oxide(AlO)

When marble is heated to 1473k, another whiter solid is obtained which reacts vigorously with water to give an alkaline solution. the solution contains

A.NaOH
B.KOH
C.Mg(OH)₂
D.Ca(OH)₂

Which of the following roles does sodium chloride play in soap production

A.react with glycerol
B.purifies the soap
C.accelerates the decomposition of fat and oil
D.separates the soap from the glycerol
E.converts the fat to its sodium salt