147. The metal used for galvanizing iron is: a) Copper b) Zinc c) Lead d) Aluminium 148. The process of extracting metals from their ores by heating them in the presence of air is... 147. The metal used for galvanizing iron is: a) Copper b) Zinc c) Lead d) Aluminium 148. The process of extracting metals from their ores by heating them in the presence of air is called: a) Roasting b) Smelting c) Refining d) Electrorefining 149. The extraction of copper from chalcopyrite is typically done by: a) Roasting and smelting b) Electrorefining c) Leaching d) Pyrometallurgy 150. Which of the following is a precious metal? a) Zinc b) Copper c) Gold d) Iron
Understand the Problem
The questions are asking about various metals and processes related to metallurgy, specifically focusing on their uses and extraction methods.
Answer
147. Zinc, 148. Roasting, 149. Roasting and smelting, 150. Gold.
The answers are: 147. Zinc, 148. Roasting, 149. Roasting and smelting, 150. Gold.
Answer for screen readers
The answers are: 147. Zinc, 148. Roasting, 149. Roasting and smelting, 150. Gold.
More Information
Galvanization involves coating iron with zinc to prevent rusting. Roasting involves heating ores in air to convert sulfides to oxides. Chalcopyrite is commonly processed by roasting and smelting. Gold is a precious metal valued for its rarity.
Tips
A common mistake is confusing the processes for metal extraction. Roasting involves air, while smelting involves melting.
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