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JAMB Chemistry

Page 17

Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes?

a.

Oxygen gas is given off at the cathode

b.

Hydrogen gas is given off at the anode

c.

Sodium metal is deposited at the cathode

d.

Alkalinity at the cathode increases

Which of the following CANNOT be obtained by fractional distillation of petroleum?

a.

Ether

b.

Methane

c.

Butane

d.

Hydrogen

When temporary hard water is boiled for some time in a kettle, the inner surface of the kettle becomes coated with a deposit of

a.

Calcium tetraoxosulphate(VI)

b.

Calcium trioxocarbonate(IV)

c.

Calcium hydrogentrioxocarbonate(IV)

d.

Aluminium trioxocarbonate(IV)

The hydrocarbon used in the production of styrene is

a.

ethyne

b.

propyne

c.

ethane

d.

ethene

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