What turns red litmus to blue?

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Acid

Base

Salt

Water

answer is B.

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Detailed Solution

Concept- Litmus is a blend of different colours generated from lichens that is water soluble. On filter papers, one of the earliest types of pH indicator—used to evaluate materials for acidity—is frequently adsorbed.
Cellulose, lichens, and wood-derived additives are the main raw ingredients used to manufacture litmus paper. As suggested by its name, litmus paper is mostly made of paper. Litmus paper needs to be free of impurities that could alter the pH of the measurement device. Litmus paper is formed of cellulose, which comes from wood, like the majority of the paper.
The main purpose of litmus is to identify an acidic or basic solution. Regarding acidic solutions, Alkaline solutions turn blue and the Litmus indicator solution turns red. This turns colourless liquids crimson. Litmus paper is available in red and blue varieties and is typically more trustworthy. We use litmus paper to test if a solution is neutral or acidic. The acid or basic strength is not exactly defined in the Litmus article.
Hence, the correct answer is option 2.

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