71. Which substance is used to retard the setting action of cement?
72. Stalactites and Stalagmites form due to the precipitation of :
73. Which of the following is not a precious/semi-precious stone?
74. The chemical substance present in bones and teeth is
75. The chemical substance present in bones and teeth is
76. Baryllium Sulphate is less soluble in water due to
77. Chile saltpeter is the common name of:
78. Setting of plaster of paris involves
79. Find the odd one:
80. The chemical name of 'Plaster of Paris' commonly used for setting broken bones is
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