Acids and Bases Post Quiz

Which of the following statements about alkalis is not true?

• Alkalis turn red litmus paper blue.

• Alkalis are good conductors of electricity.

• Alkalis can be formed from oxides of non-metals when they are dissolved in water.

• Alkalis dissolve in water forming hydroxide ions.

Which ionic equation represents the neutralisation of aqueous sodium hydroxide with dilute nitric acid?

• NaOH + H⁺ -> Na⁺ + H₂O

• Na⁺ + NO₃^- -> NaNO₃

• H⁺ + OH^- -> H₂O

• Na⁺ + HNO₃ -> NaNO₃ + H⁺

What could be the pH of a solution containing a weak acid?

• 1

• 4

• 7

• 10

Which substance reacts with hydrochloric acid to produce hydrogen?

• Calcium oxide

• Copper

• Magnesium

• Sodium hydroxide

Which of the following compounds dissolves in water to give a solution with pH greater than 7?

• Calcium carbonate

• Copper(II) hydroxide

• Silver carbonate

• Sodium hydroxide

The word equation shows a chemical reaction.

Substance S + nitric acid -> carbon dioxide + salt + water

What could substance S be?

• Iron

• Potassium carbonate

• Magnesium oxide

• Sodium hydroxide

An insect sting is alkaline. Which common substance could be used to neutralize the insect sting?

• Damp washing soda (pH 10)

• Damp salt (pH 7)

• Liquid floor cleaner (pH 11)

• Vinegar (pH 4)

Aluminium forms an amphoteric oxide. What can be deduced about aluminium oxide from this statement?

• It reacts with sodium hydroxide to form a salt.

• It decomposes on heating.

• It is soluble in water.

• It shows neither acidic nor basic properties.

Oxides of elements may be classified as acidic, basic or amphoteric.

Which set of oxides is correctly classified?

• Acidic - Carbon dioxide

  Basic - Copper(II) oxide

  Amphoteric - Zinc oxide

• Acidic - Carbon dioxide

  Basic - Zinc oxide

  Amphoteric - Copper(II) oxide

• Acidic - Copper(II) oxide

  Basic - Carbon dioxide

  Amphoteric - Zinc oxide

• Acidic - Zinc oxide

  Basic - Carbon dioxide

  Amphoteric - Copper(II) oxide

Flowers of a hydrangea bush are blue when grown in acidic soil and pink when the soil is alkaline.

Which substance is added to the soil of a hydrangea with blue flowers so that it produces pink flowers?

• slaked lime

• citric acid

• copper

• sodium chloride