1. Concentration of sulphide ore is done by

2. Malachite is an ore of

3. Ore of aluminium is

4. Removal of the unwanted materials like sand, clays, etc. from the ore is known as ………., …….. or ……….

5. For which of the following ores froth floatation method is used for concentration?

6. The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as

7. The oil used as frothing agent in froth floatation process is

8. Which of the following metals is not extracted by leaching?

9. Sulphide ore of zinc/copper is concentrated by

10. Which of the following ores is concentrated by chemical leaching method?