Quartz is a crystalline form of
1). Alumina
2). Glass
3). Silica
4). Limestone
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1. Periodic table contains how many periods
3. Which of the following is used in making smoke bombs?
4. In silvery paints, the main constituent present is
5. Question 14.21:What are nucleic acids? Mention their two important functions.
6. Which of the following constitute to form a gene?
7. Question 14.8:What are the harmful effects of photochemical smog and how can they be controlled?
8. Which of the following type of coal has the lowest proportion of volatile matter ?