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In the electrolysis of alumina, cryolite is added to :
  • a)
    Lower the melting point of alumina
  • b)
    Increase the electrical conductivity
  • c)
    Minimise the anode effect
  • d)
    Remove impurities from alumina
Correct answer is option 'A,B'. Can you explain this answer?
Most Upvoted Answer
In the electrolysis of alumina, cryolite is added to :a)Lower the mel...
Because of high melting point (2050oC), pure alumina cannot be electrolysed. Hence a mixture of alumina, cryolite (m.p. 1000oC) and calcium fluoride(to lower the temperature of the melt) is electrolysed at about 900oC. The function of cryolite is to increase the electrical conductivity of the electrolyte, and to lower the temperature of the melt.
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In the electrolysis of alumina, cryolite is added to :a)Lower the melting point of aluminab)Increase the electrical conductivityc)Minimise the anode effectd)Remove impurities from aluminaCorrect answer is option 'A,B'. Can you explain this answer?
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