71. Brass is an alloy made of which of the following:
72. Sodium Vapour Lamp is usually used as street light, because
73. Themain constituents of pearl are
74. If the weather is very humid, you must remove the emitted gas through a dry tube with . . . . . . . .
75. Washing soda can be used . . . . . . . .
76. Which of the following metals are found in free state?
77. What are Rubies and Sapphires chemically known as?
78. Which is the hardest in the following?
79. Coins of Rs. 1 and 2 are made of . . . . . . . .
80. The chemical name of . . . . . . . . is Calcium sulphate hemihydrate.
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