Which of the pH numbers indicates a neutral substance?

What colour is universal indicator in a neutral solution?

Which of the pH numbers indicates a strong acid?

Which of the following substances contain an alkali?
Baking powder
Coca cola
Distilled water
Vinegar

What is a hazard of acids and alkalis?

Which of the pH numbers indicate a strong alkali?

Which of the following substances are acidic?
An orange
Bleach
Distilled water
Washing powder

What colour is universal indicator in strong acid?

What colour is universal indicator in a strong alkali?