11. The chemical formula of sodium sulphate is:
12. These days yellow lamps are frequently used as street light. Which one of the following is used in these lamps?
13. Solder is an alloy of
14. Monazite is an ore of
15. A substance acquired in the form of brownish film on a piece of iron left in the open for some time is
16. Molecular formula of potassium nitrate is . . . . . . . .
17. The lime Ca (OH)2 reacts slowly with . . . . . . . . in air to form a thin layer of CaCO3 on the walls.
18. The chemical formula of ferrous sulphate crystals is . . . . . . . .?
19. What is the common name for sodium carbonate?
20. Which of the following metals is most ductile in nature?
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