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The amorphous form of silica is: (1) kieselguhr (2) tridymite (3) cristobalite (4) quartz

1. kieselguhr
2. tridymite
3. cristobalite
4. quartz

Correct answer: kieselguhr

Solution

Kieselguhr (diatomaceous earth) is the amorphous form of silica. Quartz, tridymite and cristobalite are all crystalline forms.

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