21. Bauxite is an ore of which of the following metals?
22. Gypsum contains . . . . . . . . . molecules of water in the form of crystalline water.
23. The formula of Calcium hydroxide is . . . . . . . .
24. In order to achieve higher temperatures, electric heating devices usually use . . . . . . . .
25. What is the chemical formula for Sodium Chloride (Salt)?
26. Which of the following metals does not react with oxygen even at high temperatures?
27. Which of the following metals cannot be obtained by reducing property of carbon?
28. Pearl is mainly constituted of
29. Iron is obtained from
30. 'German silver' is used to make decorative articles, coinage metal, ornaments etc. The name is given because
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