Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue. The impurities must be removed from the ore prior to the extraction of the metal. The processes Several steps are involved in the extraction of pure metal from ores. Metals and Non-metals are used for removing the gangue from the ore are based on the differences between the physical or chemical properties of the gangue and the ore. Different separation techniques are accordingly employed.
1. What are the impurities in ores?
a. Soil
b. Sand
c. Metals
d. Both A and B
2. Why is ores mined from earth is contaminated?
a. Many materials are togetherly found
b. Only one form of material found
3. Gangue is removed by -
a. Metals
b. Non metals
c. Both A and B
4. Ores are mined from____.
a. Earth
b. Mercury
5. Which of the following metal is extracted from cinnabar ore?
a. Sodium
b. Zinc
c. Copper
d. Mercury