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The process of converting hydrated alumi...

The process of converting hydrated alumina into anhydrous alumina is called

A

(a) Roasting

B

(b) Calcination

C

(c) Dressing

D

(d) Smelting

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The process used in converting hydrated Alumina into anhydrous alumina is called

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Define Alumina

Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. The anhydrous calcium sulphate is called :

AAKASH INSTITUTE ENGLISH-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Objective type Questions (One option is correct)
  1. Sulphide ores of metals are usually concentrated by froth floatation p...

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  2. Heating pyrites to remove sulphur is called

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  3. The process of converting hydrated alumina into anhydrous alumina is c...

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  4. The electrolytic solution used for extraction of Al in Hall Heroult me...

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  5. The extraction of zinc from zinc blende is achieved by :

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  6. Given below are the steps for extraction of copper from its ore. Write...

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  7. Which of the following metals is purified by distillation process ?

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  8. Vapour phase refining can be carried out in case of

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  9. Zone refining is based on the principle that .

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  10. Which of the following is not a method of purification of metals ?

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  11. Assertion: Zone refining method is used to produce pure metals which a...

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  12. Which of the following is not a use of aluminimum ?

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  13. Which of the following is not a use of zinc ?

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  14. Wrought iron is used for making

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  15. Which of the followed metals can be extracted by using carbon reductio...

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  16. Purest form of iron is

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  17. The metal oxide which cannot be reduced to metal by carbon is

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  18. On heating a mixture of Cu(2)O and Cu(2)S, we get

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  19. Which of the following pairs of metals is purified by van-Arkel method...

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  20. State briefly the principles which serve as basis for the following op...

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