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When limestone is heated strongly, it gi...

When limestone is heated strongly, it gives off `CO_(2)`. In matallurgy this process is known as

A

Calcination

B

Roasting

C

ore dressing

D

Sublimation

Text Solution

Verified by Experts

The correct Answer is:
C
Aluminium is extracted by electrolytic reduction of mixture of molten `Al_(2)O_(3) + Na_(3)AlF_(6) + CaF_(2)`
Due to very high energy of dissociation of `Al_(2)O_(3)`, the reduction at such high temperature will give carbide in place of metallic Al according to the following reaction. `Al_(2)O_(3) + C overset(Delta)rarr Al_(4)C_(3) + CO_(2)`
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PHYSICS WALLAH-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Level II
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  2. Process of heating ore is air to remove sulphur is:

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  3. When limestone is heated strongly, it gives off CO(2). In matallurgy t...

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  4. Which of the following metals is obtained by the self reduction proces...

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  5. Self-reduction of Cu(2)S to Cu can be carried out in.

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  6. Identify the metal M whose extraction is based on the following reacti...

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  7. Cyanide proces is used for the extraction of

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  8. Ellingham diagram represents:

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  9. Which iof the following reactions represents the self-reduction proce...

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  10. When lead nitrate is heated it breaks down into lead monoxide, nitroge...

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  11. The iron obtained from the blast furnace is called:

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  12. Which of the following fluxes is used to remove acidic impurities in ...

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  13. The metal which is obtained from both sea- water and ores form the ea...

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  14. Which metal is extracted using a hydrometallurgical process involving ...

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  15. Which of the following metals cannot be extracted by the carbon reduct...

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  16. Electrolyte reduction method is used in the extraction of

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  17. In extraction of iron, limestone is used for

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  18. Aluminium metal is purified by :

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  19. High purity copper metal is obtained by

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  20. Crystallisation method is used for

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