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In the electrolysis of alumina, cryolite...

In the electrolysis of alumina, cryolite is added to

A

lower the melting point of alumina

B

increaases the electrical conductivity

C

both (a) and (b)

D

remove impurities from alumina

Text Solution

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The correct Answer is:
A
Cryolite `(Na_(2)AlF_(6))` is added to `Al_(2)O_(3)` before electrolysis to lower the fusion temperature of bauxite in order to dissolve it and to make it good conductor of current.
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A2Z-P BLOCK ELEMENTS ( Group 13 -14)-Section D - Chapter End Test
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  2. In Goldschmidt reaction, certain metallic oxides are reduced to the me...

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  3. In the electrolysis of alumina, cryolite is added to

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  4. Specify the coordinate geometry around and hyridilization present abou...

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  5. The geometry and the hybirdisation present about the central atom in B...

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  6. Which of the following statements is correct?

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  7. H(3)BO(3) is.

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  8. How can the following reaction be made to proceed in forward direction...

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  9. Which halide is stable and has doubtful existence?

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  10. The correct order of decreasing C-O bond length of (1) CO,(II)CO(3)^(2...

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  11. Which is neutral to litmus?

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  12. (Me)(2) SiCl(2) on hydrolysis will produce.

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  13. Pb and sSn are exerted from their chief ores by:

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  14. PbO(2)on rection with HNO(3) gives gas:

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  15. An aqueous solution of a substance gives a white percipitate on treatm...

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  16. The name of the structure of silicates in which three oxygen atoms of ...

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  17. Which one of the following orders presents the correct sequence of the...

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  18. Among the following the maximum covalent character is shown by the com...

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  19. Boron cannot from which one of the following anions?

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  20. Which acid is formed when SiF(4) reacts with water?

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