Assuming the compounds to be completely dissociated in aqueous solution, identify the pair of the solutions that can be expected to be isotonic at the same temperature.

  • A
    $0.01 \ M$ urea and $0.01 \ M \ NaCl$
  • B
    $0.02 \ M \ NaCl$ and $0.01 \ M \ Na_2SO_4$
  • C
    $0.03 \ M \ NaCl$ and $0.02 \ M \ MgCl_2$
  • D
    $0.01 \ M$ sucrose and $0.02 \ M$ glucose

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