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Chemistry

Chemistry past questions and answers from WAEC and JAMB
Page 27

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

The compound that makes palm wine taste sour after exposure to air for few days is

a.

Ethanol

b.

Ethanoic acid

c.

Methanol

d.

Methaoic acid

Solubility curve can be applied in the determination of the

a.

amount of crystals formed

b.

amount of solvent that can be recovered

c.

amount of solid drugs in a given solution

d.

temperature of the solution

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