IGCSE Edexcel Chemistry Practice Test 2026 – The Comprehensive All-in-One Guide for Exam Success!

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Litmus in an alkaline solution appears as which color?

Red

Blue

Litmus is a simple pH indicator that changes color with acidity or basicity. In basic (alkaline) solutions, the litmus dye shifts to blue, while in acidic solutions it becomes red. This color change happens because the dye’s form changes with the hydrogen ion concentration, altering its color. Neutral solutions tend to give a purple color, but for an alkaline condition the blue hue is produced. So, in an alkaline solution litmus appears blue.

Purple

Yellow

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