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Science and TechnologySEE 2075

Acids turn blue litmus paper red. (True/False)

1

Answer

· Based on the official syllabus and past papers
Updated

True.

Acids are substances that release hydrogen ions (H⁺) when dissolved in water, giving them a sour taste and characteristic properties. One such property is their ability to change the color of indicators like litmus paper. Blue litmus paper contains a dye that is basic in nature. When an acid comes into contact with it, the H⁺ ions react with the dye, converting it into its acidic form, which appears red. This color change is a reliable test for identifying acids.

For example, hydrochloric acid (HCl) or sulfuric acid (H₂SO₄) will turn blue litmus paper red due to their acidic nature. This reaction is reversible: if the same paper is exposed to a base afterward, it will turn blue again. Thus, the statement is true.

Sulphuric acid (H₂SO₄)Sulphuric acid (H₂SO₄)
Structural formula of sulphuric acid, showing its acidic nature (H⁺ donors)

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