Which of the following is a strong acid?

Litmus paper turns red in the presence of:

Which of the following is a natural indicator?

What is the pH of a neutral solution at 25°C?

Which of these is a base?

Common salt (NaCl) is formed from the reaction of:

Which acid is present in vinegar?

Which of the following is a household base?

A solution with pH less than 7 is:

Which gas is released when an acid reacts with a metal?