11. Melting point of tungsten is . . . . . . . .
12. . . . . . . . . is not one of the ingredients of toothpaste.
13. Match List I with List II.
List-I (Elements)
List-II (Colour on Flame)
a. Barium
1. Yellow
b. Sodium
2. Greenish
c. Silver
3. Turns black
d. Lead
4. Apple green
| List-I (Elements) | List-II (Colour on Flame) |
| a. Barium | 1. Yellow |
| b. Sodium | 2. Greenish |
| c. Silver | 3. Turns black |
| d. Lead | 4. Apple green |
14. Which of the following reacts with water at a high rate?
15. Consider the following statements
1. The carat is a unit of purity for gold alloys.
2. 18 carat gold is 24 parts pure gold and 6 parts another metal.
Which of the statement(s) given above is/are correct?
1. The carat is a unit of purity for gold alloys.
2. 18 carat gold is 24 parts pure gold and 6 parts another metal.
Which of the statement(s) given above is/are correct?
16. In the preparation of carbon dioxide (CO2) which of the following is used?
17. The sodium metal is kept inside the . . . . . . . . to prevent exposure to oxygen.
18. Which of the following has the low density and boiling points?
19. Gypsum is?
20. Which of the following metals can be cut with a knife?
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