Q. Dry ice is -
1) Solid ice without water
2) Benzoic acid
3) Glacial acetic acid
4) Solid carbon dioxide
Q. Which of the following gases is released from rice fields in the most prominent quantities?
1) Carbon dioxide
2) Methane
3) Carbon monoxide
4) Sulphur dioxide
Q. The most commonly used bleaching agent is -
1) alcohol
2) carbon dioxide
3) chlorine
4) sodium chloride
Q. An element found in all organic compounds -
1) oxygen
2) calcium
3) nitrogen
4) carbon
Q. The chief constituent of gobar gas is -
1) ethane
2) methane
3) hydrogen
4) carbon dioxide
Q. The reaction which converts sugar solution into alcohol is an example of -
1) saponification
2) hydrogenation
3) fermentation
4) hydrolysis
Q. An element is common to all acids -
1) oxygen
2) hydrogen
3) sulphur
4) chlorine
Q. Which of the following chemicals is useful in photography?
1) Aluminium hydroxide
2) Potassium nitrate
3) Silver bromide
4) Sodium chloride
Q. Urea, a commonly used nitrogen-based fertiliser, is prepared by the reaction between ammonia and -
1) Carbon Dioxide
2) Hydrogen
3) Oxygen
4) Sulphur
Q. Disadvantage of using DDT as pesticide is -
1) it becomes ineffective after sometime.
2) Not easily degraded in nature.
3) less effective than others.
4) its high cost .
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