Chemistry · Acids, Bases and Salts

Students test various solutions with litmus paper and observe red-to-blue or blue-to-red colour changes. What is the main reason litmus paper changes color?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Litmus reacts chemically to produce entirely new permanent macromolecular compounds
2Litmus responds to hydrogen ion concentration, indicating the acidic or basic nature of the solution✓
3The colour change occurs primarily due to temperature differences of the solutions
4The colour change is caused by the rapid atmospheric oxidation of litmus molecules

Correct answer

Litmus responds to hydrogen ion concentration, indicating the acidic or basic nature of the solution

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