Chemistry
DIRECTIONS : Questions based on Chemistry.
16. | Which one of the following is correct ? Butter is |
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A. A super cooled oil | |||
B. an emulsion | |||
C. a molecular solid | |||
D. none of these |
17. | Which one of the following is an element ? | ||
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A. Topaz | |||
B. Diamond | |||
C. Ruby | |||
D. Sapphire |
18. | What are soaps? | ||
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A. Salts of silicates | |||
B. Esters of heavy fatty acids | |||
C. Sodium, salts of heavier fatty acids | |||
D. Mixture of glycerol and alcohols |
19. | In vulcanisation, natural rubber is heated with | ||
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A. carbon | |||
B. Silicon | |||
C. Sulphur | |||
D. Phosphorus |
20. | Which variety of glass is heat resistant? | ||
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A. Hard glass | |||
B. Flint glass | |||
C. Pyrex glass | |||
D. Bottle glass |