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Name the chief forms of the occurrence o...

Name the chief forms of the occurrence of the following in the earth's crust :
(i) aluminium (ii) calcium (ii) sodium (iv) lead

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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (SHORT ANSWER QUESTIONS)
  1. Predict the modes of occurrence of the following three types of metals...

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  2. Name the chief forms of the occurrence of the following in the earth's...

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  3. Discuss some of the factors which need consideration before deciding o...

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  4. What is the difference between a rock and a mineral ?

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  5. How do elements generally occur?

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  6. What is meant by minerals and ores ? Are all minerals ores?

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  7. Name the methods used for the concentration of ores.

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  8. What is calcination and roasting ?

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  9. Giving appropriate examples (at least three), explain how the reactivi...

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  10. The choice of a reducing agent in a particular case depends upon therm...

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  11. Name three metals which are obtained by the reduction of their oxides ...

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  12. Which methods would you recommed for the purification of impure metals...

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  13. Distinguish: Slag and flux

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  14. Distinguish: Gravity and floatation process

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  15. Silver ores and native gold have to be leached with metal . cyanides. ...

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  16. Explain briefly the term poling.

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  17. What is liquation ?

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  18. Describe briefly Van Arkel method for refining of metals.

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  19. What is the principle of zone refining of metals?

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  20. Carbon monoxide is more effective reducing agent than carbon below 983...

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