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NTA Abhyas JEE Main2020ChemistrySolutionsPractice

At a constant temperature, which of the following aqueous solutions will have the maximum vapour pressure? (Mol . wt . NaCl = 58 .5, H 2 SO 4 = 98 .0 g mol − 1 )

Options

  1. A1 molal NaCl (aq)
  2. B1 molar NaCl (aq)
  3. C1   molal   H 2 SO 4   aq
  4. D1   molar   H 2 SO 4   aq

Correct answer

A. 1 molal NaCl (aq)

Step-by-step solution

One molar (1   M) aqueous solution is more concentrated than one molal aqueous solution of the same solute. In solution, H 2 S O 4 provides three ions. While NaCl provides two ions. Hence, vapour pressure of solution of NaCl is higher (as it gives less ions). Therefore, 1   molal   NaCl will have the maximum vapour pressure.

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