Acid and Bases II

Which property is not characteristic of a base?

• It reacts with a carbonate to form carbon dioxide.

• It reacts with an acid to form a salt.

• It reacts with an ammonium salt to form ammonia.

• It turns universal indicator paper blue.

Which reaction is not characteristic of an acid?

• It dissolves magnesium oxide.

• It produced ammonia from ammonium compounds.

• It produced carbon dioxide from a carbonate.

• It produced hydrogen from zinc metal.

Which statement is not correct?

• When a base reacts with an ammonium salt, ammonia is given of.

• When an acid reacts with a base, neutralisation takes place.

• When an acid reacts with a carbonate, carbon dioxide is given off.

• When the acidity of a solution increases, the pH increases.

Which substance is most acidic?

• calcium hydroxide, pH 12

• lemon juice, pH 4

• milk, pH 6

• washing up liquid, pH 6

The graph shows how the pH of soil in a field changes over time.

At which point was the soil neutral?

• A

• B

• C

• D

A gas is escaping from a pipe in a chemical plant.

A chemist tests this gas and finds that it is alkaline.

What is this gas?

• ammonia

• chlorine

• hydrogen

• sulfur dioxide

Some reactions of a substance, R, are shown in the diagram.

What type of substance is R?

• an acid

• a base

• an element

• a salt

The diagram shows the pH values of four solutions.

Which of these solutions are alkaline?

• P only

• P and Q only

• Q, R and S only

• R and S only

An aqueous solution of the organic compound methylamine has a pH greater than 7.

Which statement about methylamine is correct?

• It neutralises an aqueous solution of sodium hydroxide.

• It reacts with copper(II) carbonate to give carbon dioxide.

• It reacts with hydrochloric acid to form a salt.

• It turns blue litmus red.

Ant stings hurt because of the methanoic acid produced by the ant. Which substance could, most safely, be used to neutralise the acid?

• car battery acid, pH 1

• baking soda, pH 8

• lemon juice, pH 3

• oven cleaner. pH 14