Which of the following elements are in Group 18 in the Periodic Table of Elements?

• Argon and xenon

• Hydrogen and oxygen

• Oxygen and xenon

• Argon and hydrogen

What is the meaning of oxidation?

• Loss of oxygen

• Gain of hydrogen

• Loss of electron

• Decrease in oxidation number

Which of the following has the highest rate of reaction?

• Rusting of iron

• Fermentation of sugar

• Decomposition of food

• Combustion of alcohol

Diagram 1 shows the extraction of a metal from its ore through electrolysis.

What is the function of cryolite?

• To produce more metal

• To prevent the electrodes from being oxidized

• To act as a catalyst

• To lower the melting point of the metal ores

What is the function of lecithin in ice cream making?

• Make it last longer

• As a stabiliser

• As artificial flavour

• Prevent it from being oxidised

Which statement is correct about catalyst?

• Only exists as solid at room temperature

• Affect the amount of products formed

• Chemically unchanged after the reaction

• Totally used up in the reaction

Who discovered proton and neutron of an atom? A

• A

• B

• C

• D

Which of the following is a strong acid?

• Nitric acid

• Methanoic acid

• Oxalic acid

• Phosphoric acid

The following statement shows the characteristics of a metal.

Which of the following metals has the above characteristics?

• Sodium

• Barium

• Calcium

• Iron

Diagram 2 shows an apparatus set-up to prepare a soluble salt.

Which of the following salt is prepared by this method?

• Zinc chloride

• Sodium sulphate

• Copper(II) sulphate

• Lead(II) nitrate