$12 \ g$ of urea is dissolved in $1 \ L$ of water and $68.4 \ g$ of sucrose is dissolved in $1 \ L$ of water. The lowering of vapour pressure of the first case is

  • A
    equal to the second
  • B
    greater than the second
  • C
    less than the second
  • D
    double that of the second

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