What does the term 'indicator' refer to in the context of litmus paper?

A substance that increases temperature

A color-changing substance for pH testing

A solution that does not react

A solid that dissolves in water

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Q1.

What is the pH of a neutral solution?

Q2.

Which of the following substances is acidic?

Q3.

What color does blue litmus paper turn when dipped in an acidic solution?

Q4.

What can be inferred if red litmus paper remains red when dipped in a solution?