CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements Quiz 2

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CBSE › Class 12 › Chemistry › General Principles and Processes of Isolation of Elements

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1. How do we separate two sulphide ores by froth floatation method?

A By using excess of pine oil B By adjusting proportion of oil to water or using depressant. C By using some solvent in which one of the sulphides is soluble D By using collectors and froth stabilisers like xanthates

2. Common impurities present in bauxite are

A CuO B ZnO C CaO D SiO

3. An ore of tin containing FeCrO

A gravity separation B magnetic separation C froth floatation D leaching

4. Which of the following ores cannot be concentrated by magnetic separation?

A Haematite B Malachite C Magnetite D Siderite

5. The significance of leaching in the extraction of aluminium is

6. from the bauxite ore

7. Which of the following metals is extracted using a silica lined convertor?

A Mg B Al C Cu D Zn

8. Which of the following sulphides when heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?

A Cu B FeS C HgS D ZnS

9. Which of the following metals cannot be obtained by reduction of its metal oxide bv aluminium ?

A Cr B Mn C Fe D Mg

10. Heating pyrites to remove sulphur is called

A smelting B calcination C liquation D roasting

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