Q43 / 180 · KCET 2015 · Chemistry

Cryolite is

  • A
    \( \mathrm{N} a_{3} A l F_{6} \) and is used in the electrolysis of alumina for decreasing electrical conductivity.
  • B
    \( \mathrm{Na}_{3} \mathrm{Al} F_{6} \) (i and is used in the electrolysis of alumina for lowering the melting point of
    alumina only.
  • Correct answer
    C
    \( \mathrm{Na}_{3} \mathrm{Al} F_{6} \) and is used in the electrolysis of alumina for lowering the melting point and
    increasing the conductivity of alumina.
  • D
    \( \mathrm{Na}_{3} A l F_{6} \) and is used in the electrolytic refining of alumina.

Solution

Cryolite is \( \mathrm{N} a_{3} \mathrm{Al} \mathrm{F}_{6} \) and is used in the electrolysis of alumina for lowering the melting point and increasing the
conductivity of alumina.

Hence, the correct answer is option: 'C'.

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