Red litmus paper turns blue when placed in a base, Option A is the correct answer.
What is a Litmus Paper ?
A litmus paper is a pH indicator which predicts the acidity and alkalinity of a solution.
It's a filter paper treated with a lichen-provided natural-soluble dye.
There are two colours of paper to predict the acid and base solutions.
In an acidic medium , blue litmus paper change into red, while
In basic medium red litmus paper turn into blue.
Therefore , Red litmus paper turns blue when placed in a base, Option A is the correct answer.
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