71. Stains of rust on clothes can be removed by :
72. One of the constituents of tear gas is
73. The element used for making solar cells is
74. DDT and BHC may act as
75. Gunpowder consists of a mixture of
76. Detergents are
77. The metal compound commonly found in Sindhoor or Kumkum is based on
78. Substance used as an anti freeze in radiators of automobiles is :
79. Which of the following is used to remove rust stains on cloth?
80. Which is not an anasthetic agent in surgical operations?
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