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Question

 How is charcoal prepared?


  1. When wood is heated with cow dung and CO2 then the residue is charcoal.

  2. When wood is boiled in water, after evaporation the residue is charcoal.

  3. When wood is burnt in a limited supply of oxygen & water until volatile materials are removed, the residue is charcoal.

  4. All of these.


Solution

The correct option is C

When wood is burnt in a limited supply of oxygen & water until volatile materials are removed, the residue is charcoal.


When wood is burnt in a limited supply of oxygen and water until volatile materials are removed, the residue left is charcoal.

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