DIRECTIONS : Questions based on Chemistry.
36. |
Which one of the following is present in the emission from "unleaded petrol"? |
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A. carbon monoxide |
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B. carbon dioxide |
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C. ethylene |
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D. hydrocarbons |
38. |
Chloro-fluro-carbon gases are not used in which of the following? |
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A. aerosol sprays |
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B. fire-extinguishers |
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C. refrigerators |
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D. air-conditioning |
39. |
Among the following elements, which one is not present in a pure sugar? |
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A. Carbon |
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B. hydrogen |
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C. Nitrogen |
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D. oxygen |
40. |
Which one of the following has the highest fuel value? |
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A. hydrogen |
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B. charcoal |
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C. natural gas |
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D. gasoline |