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In the electrolysis of alumina, cryolite...

In the electrolysis of alumina, cryolite is added to

A

lower the m.p. of alumina

B

increase the electrical conductivity

C

minimise the anode effect

D

remove impurities from alumina

Text Solution

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The correct Answer is:
B
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FIITJEE-PREPARATION AND PROPERTIES OF COMPOUNDS AND GENERAL DISCUSSION OF S-AND P-BLOCK ELEMENTS-SOLVED PROBLEMS (OBJECTIVE)
  1. N(2)O is formed when:

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  2. The true statement for the acids of phosphorus, H(3)PO(2), H(3)PO(2) a...

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  3. Extra pure N2 can be obtained by heating

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  4. The reaction of P(4) with X leads selectively to P(4)O(6) The X is :

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  5. A white solid (X) gives golden yellow flame on platinum wire. A piece ...

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  6. A solution of sodium metal in liquid ammonia is strongly reducing due ...

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  7. Amongst sodium halides, NaF has the highest m.p. because it has

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  8. The molecular formula of Glauber's salt is

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  9. A solution of sodium sulphate in qater is electrolysed using inert ele...

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  10. Which of the following does not give flame test?

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

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  12. Butter of tin is

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  13. Which of the following is/are amphoteric?

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  14. Tin (ll) chloride is used

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  15. White phosphorus (P(4)) has

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  16. Pyrophosphorous acid, H(4)P(2)O(5)

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  17. Which of the following properties decrease from top to bottom down the...

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  18. The compounds(s) formed upon combustion of sodium metal in excess air...

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  19. The nirogen oxide (s) that contains N-N bonds is/are

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  20. In the reaction 2X+B(2)H(6)to[BH(2)(x)(2)]^(4)][BH(4)]^(-) the amine...

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