JUNIOR SCHOOL SUBJECT CHALLENGE

Which of the following describes an acid?

• sour

• caustic

• neutral

• bitter

Which of these substances is an acid?

• water

• bleach

• orange juice

• washing powder

The reaction of an acid and a base produce water and what?

• sand

• yeast

• salt

• soap

What colour does a red litmus paper turn when added to an alkali?

• Blue

• Red

• Green

• Colourless

A substance which neutralizes an acid to form salt and water only is said to be a/an

• Metal

• Non-metal

• Base

• Salt

A reaction between a base and an acid is known as

• combination

• displacement

• neutralisation

• salting out

What is the pH of distilled water?

• pH 12

• pH 8

• pH 7

• pH 3

Which of these gases is responsible for acid rain

• Sulphur dioxide

• Oxygen

• Hydrogen

• Helium

A wasp sting is alkali. Which substance would neutralise the sting?

• Vinegar

• Bleach

• Baking soda

• Distilled water

Calcium hydroxide is an alkali which is also known as

• potash alum

• washing soda

• slaked lime

• caustic soda