71. The metal reacts with steam of to form oxides is . . . . . . . .
72. The chemical name of limestone is
73. Aluminium metal is only extracted by the following:
74. Mercury is basically used in thermometer devices because its especiality is
75. Tin layer is applied to food utensils, not zinc.
76. Which of the following gases is released when hydrochloric acid is mixed with sodiumbicarbonate?
77. Which one of the following is the hardest metal?
78. Name the metal that can be easily cut with a knife:
79. Which of the following metals is required to be kept in oil?
80. Which are the materials generally employed as solder in soldering operation in electronics?
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