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Paper becomes brittle and yellow with age. Why ?
1) The acid content in paper causes brittleness to develop
2) In the presence of visible light, photosensitised oxidation occurs
3) The ultra-violet component of sunlight causes photolysis of cellulose by direct cleavage of the cellulose polymer.
1 and 2
2 and 3
1 and 3
1, 2 and 3
- Statement 1: The acid content in paper (often from alum or lignin) breaks down cellulose fibers over time, making paper brittle.
- Statement 2: Visible light can speed up oxidation in paper with the help of photosensitizers, making the paper yellow and fragile.
- Statement 3: Ultraviolet light from sunlight causes direct cleavage (breaking) of cellulose chains, leading to photolysis, yellowing, and brittleness.
- Option 4: 1, 2, and 3 — All three statements are true and contribute together to the aging, yellowing, and brittleness of paper.
The correct answer is Option 4: 1, 2 and 3.
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