81. Which one of the following forms of phosphorus is most reactive?
82. Limestone is a raw material used by which industry?
83. The element absorbed both in cation and anion form is
84. Cement containing excess amount of lime
85. Commercially, sodium bicarbonate is known as
86. Sodium vapour lamps glow with yellow colour. This is due to
87. Which amidst the following is not a gem stone ?
88. Calcium salts used as fertilizer is :
89. Aluminium salt commonly used to stop bleeding is
90. In silvery paints, the main constituent present is
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