81. Bauxite is the ore of
82. The quartz used in watches is . . . . . . . .
83. Consider the following statements
1. Galvanisation is the method of protecting steel and iron fromrusting by coating them with a thin layer of zinc.
2. Pure iron is very soft but if it is mixed with a small amount of carbon, it becomes hard and strong.
3. When iron is mixed with nickel and chromium, we get stainless steel, which is hard and does not rust.
Which of the statements given above are correct?
1. Galvanisation is the method of protecting steel and iron fromrusting by coating them with a thin layer of zinc.
2. Pure iron is very soft but if it is mixed with a small amount of carbon, it becomes hard and strong.
3. When iron is mixed with nickel and chromium, we get stainless steel, which is hard and does not rust.
Which of the statements given above are correct?
84. The milkman adds a little bit of baking soda to the fresh milk:
85. What is the dominant chemical present in detergent powder?
86. What would be the molecular formula of calcium phosphate?
87. Heaviest metal of the following is made of
88. Which of these chemicals is not soluble in water?
89. Which of the following is the symbol of the metal that occurs in liquid form at ordinary temperature?
90. What is the product formed when sodium bicarbonate is heated strongly?
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