71. Which of the following is not a form of Calcium Carbonate?
72. Match List-I with List-II and select the correct answer:
List-I (Naturally occurring substance)
List-II (Elements present)
a. Diamond
1. Calcium
b. Marble
2. Silicon
c. Sand
3. Aluminium
d. Ruby
4. Carbon
| List-I (Naturally occurring substance) | List-II (Elements present) |
| a. Diamond | 1. Calcium |
| b. Marble | 2. Silicon |
| c. Sand | 3. Aluminium |
| d. Ruby | 4. Carbon |
73. Zinc can separate copper from copper sulphate solution, because zinc-
74. Gold is soluble in which of the following:
75. Sodium calcium silicate is called . . . . . . . .
76. Choose odd from the following.
77. How many water molecules are present in a molecule of ferrous sulphate crystal?
78. . . . . . . . . atoms are present in sodium carbonate molecule.
79. What is the chemical formula of bleaching powder?
80. Which of the following reactions removes the highly reactive metals from the pure molten ore?
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