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



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