71. The soil in which insectivorous plants grow in deficient in
72. Which one of the following is a non-metallic mineral?
73. The hardest natural substance is-
74. Fuel used for rocket propulsion is a mixture of
75. Which one of the following elements exist in liquid state at room temperature?
76. Matchsticks are made up of . . . . . . . .
77. Which of the following gases is popular as laughing gas?
78. Property of attracting electrons by halogen atoms is known as . . . . . . . .
79. Which of the following inert gas has only two electrons in its outer most cell?
80. Being light and non-inflammable, . . . . . . . . gas is used to blow balloons.
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