61. The addition of gypsum to portland cement helps in :
62. Which gas is most stable at room temperature?
63. Which of the following is used as a preservative to protect processed food?
64. Chemical composition of cement is
65. Which one of the following elements is used in the manufacture of fertilizers ?
66. Asbestos is formed of :
67. Bayer's reagent is
68. Bone ash contains
69. Cement is made hard with
70. 'Plaster of Paris' is made by partial dehydration of
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