UNIZIK Chemistry 2007/2008 Day 1 Past Questions

Question 1

The following are uses of sulphur except

A.prevention of the growth fungi
B.vulcanization of rubber
C.manufacture of dyes
D.coating of steel to prevent rusting

Objective

Question 2

An acid present in protein is

A.lactic acid
B.amino acid
C.palmitic acid
D.stearic acid

Objective

Question 3

The noble gas argon is used for :

A.electric welding
B.welding brass
C.Under water welding
D.steel welding

Objective

Question 4

Phosphorus is stored under water to prevent if from

A.smelling
B.dehydrating
C.catching fire
D.becoming inert

Objective

Question 5

Which of the following compound is aromatic .

A.Benzene
B.Hexane
C.Cyclobutane
D.Cyclopentane

Objective

Question 6

Which of the following does not affect the rate of chemical reaction?

A.concentration of the reactants
B.addition or presence of a catalyst
C.size of the reacting particles
D.the enthalpy change for the reaction

Objective

Question 7

A salt which losses mass when exposed to air is

A.hygroscopic
B.deliquescent
C.efflorescent
D.effervescent

Objective

Question 8

Which of the following statements is not correct?

A.carbon exhibits allotropy
B.sulphur exhibits allotropy
C.chlorine exhibits allotropy
D.nitrogen is a gas

Objective

Question 9

How many carbon atoms are there in the benzene ring?

A.4
B.5
C.6
D.8

Objective

Question 10

Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?

A.pure sodium chloride does not conduct electricity
B.potassium chloride prevents the sodium produced from attacking the electrodes
C.potassium fluoride acts as a catalyst
D.potassium fluoride reduces the temperature at which chloride fuses.

Objective

Question 11

Which of the following is used extensively in manufacturing photographic chemical

A.Aluminum chloride
B.zinc chloride
C.silver-chloride
D.chloride

Objective

Question 12

Catalytic hydrogenation of oils results in the production of :

A.soap
B.detergent
C.butter
D.margarine

Objective

Question 13

A sample of orange Juice is suspected to be contaminated with a yellow dye. Which of the following, methods ean used to detect the dye?

A.decantation
B.chromatography
C.distillation
D.evaporation

Objective

Question 14

When a solid melts and consequently boils, there is

A.a gradual increase in the average kinetic energy of the particles
B.a sudden decrease in the kinetic energy of the particles
C.a rapid change in the nature of bonding of the components
D.a change in the size of the fundamental particles

Objective

Question 15

Which of the following compound will undergo addition reaction?

A.Ethyne
B.Butane
C.pentane
D.Ethanol

Objective

Question 16

A catalyst which increase the rate of a chemical reactions does so by:

A.increase the reaction pathway
B.increasing the surface area of the reactant
C.Decreasing the temperature at which the reactant occurs
D.decreasing the activation energy of the reaction

Objective

Question 17

Which of the following correctly explain entropy?

A.The natural tendency for a system to achieve a greater disorder
B.A measure of the rate attaining equilibrium in a reversible reaction
C.the cause of spontaneity of a reaction
D.a measure of the enthaphy of a reaction.

Objective

Question 18

The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI) acids is

A.HS
B.SO
C.O₂
D.SO₂

Objective

Question 19

Which of the following pollutants is biodegradable?

A.Sewage
B.plastic
C.lead compound
D.hydrogen sulphide

Objective