$KBr$ has a rock salt type structure and has a density of $3.70 \ g/cm^3$. The edge length of the unit cell is approximately [molecular weight of $KBr = 120 \ g/mol$]:

  • A
    $3 \times 10^{-8} \ cm$
  • B
    $12 \times 10^{-8} \ cm$
  • C
    $9 \times 10^{-8} \ cm$
  • D
    $6 \times 10^{-8} \ cm$

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