Acids and Alkalis

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

• Blue

• Red

• Green

• Colourless

Which pH levels indicated a strong acid?

• 1-3

• 4-6

• 8-11

• 12-14

Which pH level indicates a weak alkali?

• 1-3

• 4-6

• 8-11

• 12-14

What does this hazard symbol mean?

• toxic

• flammable

• corrosive

• explosive

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

Acid in our stomach:

• Hydrochloric acid

• Sulfuric acid

• Acetic acid

• Carbonic acid

The color of universal indicator in pure water:

• Red

• Blue

• Purple

• Green

The color of universal indicator in sodium hydroxide:

• Red

• Yellow

• Purple

• Green

Whihc of the following statement is True?

• The colour of methyl orange in acid solution is yellow.

• The basicity of CH₃COOH is 4.

• H₂SO₄ is a weak acid.

• A strong acid can completely dissociate in water to give H⁺ ions.

Which of the following is a weak alkali?

• NH₃

• NaOH

• KOH