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Page-6 |
Chemistry |
| 76)The gas evolves during the fermentation of a sugar solution is |
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sulphur dioxide |
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carbon dioxide |
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carbon monoxide |
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methane |
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| 77)The main compound formed during the fermentation of cane juice is |
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common salt |
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glucose |
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ethyl alcohol |
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chloroform |
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| 78)The pH of an aqueous solution of acetic acid is 2. It would increase on the addition of |
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aqueous ammonia |
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cane sugar |
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hydrochloric acid |
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common salt |
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| 79)Commercially the production of ammonia is important because it can be used in the |
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preparation of soaps |
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manufacture of artificial foods |
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manufacture of proteins by polymerization |
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production of fertilisers |
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| 80)The element not present in fertilisars is |
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nitrogen |
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chlorine |
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hydrogen |
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phosphorus |
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| 81)The raw material not found in nature is |
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petrol |
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carbon dioxide |
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vinyl chloride |
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water |
| Answer : |
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| 82)The natural substance from which energy can be harnessed, which is essentially made up of only one element is |
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water in dam |
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petroleum |
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coal |
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air |
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| 83)The substance that can conduct electricity in its molten state is |
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sugar |
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urea |
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glucose |
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common salt |
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| 84)Which statement does not apply to a gaseous substance? |
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If the temperature is increased, its molecules move more randomly |
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its molecules are packed closely together in a regular arrangement |
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Its molecules collide with each other |
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Its molecules collide with the walls of the container and exert pressure |
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| 85)Water is not effective in extinguishing a fire caused by petrol because |
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water and petrol are immiscible with each other. Petrol forms the upper layer and continues to burn |
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the flame is too hot for water to cool it down |
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water and petrol are miscible with each other |
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water and petrol react chemically |
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| 86)The substance that is not polymeric in nature is |
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starch |
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glucose |
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polyvinyl chloride |
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nylon |
| Answer : |
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| 87)The group of substances industrially prepared by electrolysis is |
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nitogen, oxygen, aluminium |
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sugar, common salt, iron |
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caustic soda, chlorine, aluminium |
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ethyl alcohol, chlorine, caustic soda |
| Answer : |
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| 88)The process that involves a chemical change is |
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mixing of petrol and ethyl alcohol |
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dissolution of common salt in water |
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refining of petroleum by fractional distillation |
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combustion of petrol in motor cars |
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| 89)The gas that causes atmospheric pollution is |
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nitrogen |
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neon |
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sulphur dioxide |
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steam |
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| 90)Diamond is made of the same single element as |
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graphite |
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common salt |
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sugar |
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chloroform |
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