Acids and Bases

Three types of alkalis can react with acids to produce salt and water. What are they?

• Metal chloride, oxide and peroxide

• Metal sulfide, hydroxide and carbonate

• Metal oxide, carbonate and hydroxide

• Metal fluoride, oxide and hydroxide

Which of the following neutralisation reactions produces a gas of carbon dioxide?

• Hydrochloric acid and metal oxide

• Nitric acid and metal hydroxide

• Sulfuric acid and metal

• Nitric acid and metal carbonate

The formulas of the three most common acids we use in school are

• HCl, HNO3, H2SO4

• HNO3, H2SO4, CH3COOH

• H2SO4, NH3, H2CO3

• H2CO3, H2SO3, HCl

The MAIN acid that causes acid rain is

• H2SO4

• HNO3

• H2SO3

• H2CO3

Insoluble metal oxides can change the colour of pH paper to

• Red

• Blue

• No effect

• Green

Soluble non-metal oxides dissolve in water to produce

• neutral solutions

• acids

• universal indicators

• alkalis

Soluble metal oxides dissolve in water to produce

• neutral solutions

• acids

• universal indicators

• alkalis

What happened to the pH of the acid as it became more dilute?

• The pH decreased

• The pH stayed the same

• The pH increased

• None of the above

What happened to the concentration of the hydroxide ions as the alkali became more dilute?

• The concentration of the hydroxide ions increased

• The concentration of the hydroxide ions decreased

• The concentration of the hydroxide ions remained unaffected with the dilution of the alkalis

• The concentration of the hydroxide ions decreased

In conductivity, concentrated acids or alkalis are considered to be

• very bad conductors of electricity

• weak conductors of electricity

• excellent conductors of electricity

• resistant to electricity