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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?
Verified Answer
In the electrolysis of alumina, cryolite is added to :a)lower the melt...
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.
NOTE : 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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