Which of the following metals occurs In free state ?
1). Copper
2). Iron
3). Zinc
4). Lead
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1. Which gas is used for converting vegetable oils into saturated fats ?
2. Which of the following caused radioactive pollution along the coast of Kerala?
3. The element used in the manufacture of safety matches is
4. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water.
5. Cloud is a colloidal dispersion of
6. Which of the following in automobile exhaust can cause cancer
7. In which of the following states maximum iron ore is found ?