Why the pages in new books look white while those in older books turn yellow?

The paper contains tiny amounts of acid.

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The paper contains tiny amounts of base.

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The paper contains tiny amounts of alkali.

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None of these.

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Solution

The correct option is A
The paper contains tiny amounts of acid.

This is because paper contains tiny amounts of acid. This acid slowly breaks down the cellulose fibres in the paper which change the colour of paper from white to yellow. The reaction speeds up in sunlight and the paper may turn brown and become brittle.

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