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    				| 1. | Answer the following : 1. State one industrial use of copper. 2. Mention one advantage of generating power from bio-gas. 3. Name the mineral that toughens steel and makes it rust-proof. | 
| Answer» 1. It is used in power cables. 2. It does not cause any pollution. It is a cheap source of energy. It prevents the loss of trees and manure due to burning of fuel wood and cow dung cakes. 3. Manganese | |