Chapter 6 Practice Quiz (Acid, Base and Salt)

Which substance is alkali?

• Copper(II) hydroxide

• Sodium hydroxide

• Magnesium hydroxide

What is the purpose of adding calcium oxide (quicklime) to acidic soil?

• To add nutrients to the soil

• To prevent the soil from becoming too dry

• To introduce more air to the soil

• To neutralise the acid in the soil

Which method is used to prepare sodium sulphate?

• Titration

• Adding an acid to a metal

• Adding an acid to a metal carbonate

• Precipitation

Which of the following salts is suitable to be prepared using the double decomposition method?

• silver nitrate

• sodium chloride

• barium sulphate

• magnesium sulphate

Gas X forms a white vapour when mixed with concentrated ammonia solution. X might be

• Hydrogen chloride

• Carbon dioxide

• Ammonia

• Sulphur dioxide

When a bit of ammonia is added into the aqueous solution of copper(II) sulphate, blue precipitate is formed. Which of the following is expected to happen to the blue precipitate when aqueous ammonia solution is added until it is in excess?

• Not soluble in excess ammonia solution

• Soluble in excess aqueous ammonia to produce dark blue solution

• Soluble in excess aqueous ammonia solution to produce colourless solution

• Not soluble in excess aqueous ammonia solution which changes to become a dark blue precipitate

Compound P is white in colour. When compound P is heated strongly, the residue formed is yellow when hot but white when cooled. Compound P also produces a brown gas. Which of the following is compound P?

• Magnesium nitrate

• Ammonium carbonate

• Potassium nitrate

• Zinc nitrate

Which of the following salts is not soluble in water?

• Calcium nitrate

• Zinc carbonate

• Potassium sulphate

• Ammonium chloride

Which of the following substances are used to prepare barium sulphate?

• barium nitrate and sodium sulphate

• barium carbonate and hydrochloric acid

• barium and sulphuric acid

Which of the following gases will change the colour of acidified potassium dichromate(VI) solution from orange to green?

• Hydrogen chloride

• Sulphur dioxide

• Nitrogen dioxide

• Ammonia