Of the following which one pollutes the air of abig city?
1). Copper
2). Chromium
3). Lead
4). Calcium
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1. Vulcanization of rubber is carried out by adding
2. An emulsion is a colloidal solution of
3. German silver, an alloy, does not contain the metal
4. Which of the following is used in making smoke bombs?
5. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
7. Dry powder fire extinguishers contain
8. The common name of sodium bicarbonate is
9. The Bhopal tragedy was caused by the gas
10. Which one of the following is used as a sowing agent in the preparation of soft drinks?