Question 51. ‘Gobar gas’ contains mainly________
Answer: methane
Question 52. In an atom no two electrons have all the four quantum numbers identica. This is known as________
Answer: Pauli’s Exclusion Principle
Question 53. Acid precipitation is now regarded as a serious problem in some European and Asian countries. Its major cause or source is________
Answer: emissions of sulphur oxides and nitrogen oxides from thermal power plants and burning of fossil fuels; these oxides dissolve in atmospheric water vapour and fall back on earth as acid rain.
Question 54. Vinegar is an aqueous solution of________
Answer: acetic acid
Question 55. The acid that can be used as a hypnotic is________
Answer: barbituric acid
Question 56. The most malleable metal is________
Answer: gold
Question 57. The hottest part of the gas flame is known as the_____
Answer: nonluminous zone
Question 58. Camphor can easily be purified by the process of_____
Answer: sublimation
Question 59. The gas us ed for artificial ripening of green fruit is_____
Answer: ethylene
Question 60. A balanced fertiliser for plants is________
Answer: compost
Question 61. In order to lower the temperature below 0°C, the substance mixed with ice is________
Answer: sodium chloride
Question 62. The method that can not be used for removing permanent hardness of water is________
Answer: boiling
Question 63. The National Chemical Laboratory is situated in_____
Answer: Pune
Question 64. Petroleum is found in________rock.
Answer: igneous
Question 65. The main active constituent of tea and coffee is_____
Answer: caffeine
Question 66. Containers for carrying strong acids are made of____
Answer: lead
Question 67. The branch of chemistry dealing with the accurate determination of the amounts of various substances is called________
Answer: analytical chemistry
Question 68. The main use of salt in the diet is to________
Answer: produce in s mall amounts the hydrochloric acid required for the digestion of food
Question 69. The gas used in the manufacture of vanaspati from vegetable oil is________
Answer: Hydrogen
Question 70. A flaming splinter is thrust into a bottle of oxygen, a bottle of nitrogen, and a bottle of carbon dioxide. The flame will go out in________
Answer: Nitrogen and Carbon dioxide but not in Oxygen
Question 71. ________is the measure of performance of petrol in internal combustion engines.
Answer: Octane number
Question 72. Of the Beer, Vodka, Wine and Gin drinks, tell which one has the lowest alcohol content_____
Answer: Beer
Question 73. Soda water contains________
Answer: Carbonic acid
Question 74. Cooking gas supplied in cylinders by gas agencies is_
Answer: liquid
Question 75. For the production of iron, the raw material used is___
Answer: coke
Question 76. Paracetamol relieves________
Answer: body pain
Question 77. Chloromycetin is________
Answer: antibacterial
Question 78. In the industrial production of vegetable ghee, the process involved is________
Answer: reduction
Question 79. Chemically, cane sugar is________
Answer: sucrose
Question 80. For respiration, deep-sea divers use a mixture of_____
Answer: oxygen and nitrogen
146 videos|358 docs|249 tests
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1. What is the scientific method? |
2. How does photosynthesis work? |
3. What is the difference between an element and a compound? |
4. What are the three states of matter? |
5. What is the difference between a physical change and a chemical change? |
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