UNIPORT Chemistry 2015/2016 Model 1 Past Questions

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

Kerosine is commonly used to remove the red colour stain of palm oil from clothes because it.

A.helps to spread the oil over a larger surface area
B.reacts with the oil to form an odourless compound
C.makes the oil evaporate easily by dissolving it
D.helps to dilute the oil and reduce its colour

The most suitable metal that can be used as a lightning conductor is

A.silver
B.copper
C.iron
D.aluminium

Equal moles of ethyne and hyrogen iodide react to give

A.CH₂=CH₂
B.CH₃-CHI
C.CH₃Cl₃
D.CH₂=CHI

The air around smelting industries is likely to contain

A.H₂S, CO and N₂
B.CO₂, SO₃ and H₂
C.H₂, SO₂ and CO₂
D.SO₂, N₂ and CO,

The gas that is the most dangerous pollutant to humans is

A.sulphur (IV) oxide
B.carbon (IV) oxide
C.nitrogen (II) oxide
D.hydrogen sulphide

The shape of the hydrocarbon compound CH₄ is

A.squre planar
B.planar
C.linear
D.tetrahedral

NH₄Cl(s) <==> NH₃(g) +HCl.
The reaction above can only attain equilibrium if

A.a gaseous reactant is added
B.one of the products is removed
C.it is in a closed system
D.it is in an open system

Water has the ability to dissolve almost all substances because its molecule has a structure with

A.one positive end and one neutral end
B.two positive ends
C.one positive end and one negative end
D.two negative ends

The property used in the industrial preparation of nitrogen and oxygenfrom air is

A.rate of diffusion
B.density
C.boiling point
D.solubility

H₂(g) + Br₂(g) 2HBr(g) The reaction above is carried out at 25°C. If ΔH is -72 kJ mol-¹ and ΔS is -106 J mol-¹K-¹, the reaction will

A.proceed spontaneously at lower temperatures
B.not proceed spontaneously at the given temperature
C.proceed spontaneously at the given temperature
D.proceed in the reverse direction at the given temperature