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Why is the molecular mass determined by ...

Why is the molecular mass determined by measuring colligative property in case of some solutes is abnormal ?

A

Due to association or dissociation of solute molecules

B

Due to insolubility of solute molecules

C

Due to decomposition of solute molecules

D

Due to large size of solute molecules.

Text Solution

Verified by Experts

The correct Answer is:
A
Due to association or dissociation of solute molecules there is a change in number of particles . Since colligative properties depend on number of particles there is a change in molecular mass.
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The colligative properties of solutions

Knowledge Check

  • The colligative properties of a solution are

    A
    `prop` molality
    B
    `prop (1)`/`("molecular mass of the solute")`
    C
    proportional to each other
    D
    independent of the nature of the solute, i.e., electrolyte or non-electrolyte.

  • The molecular mass of sodium chloride obtained by using a colligative property is

    A
    58.5 g/mol
    B
    29.25 g/mol
    C
    117 g/mol
    D
    85 g/mol

  • The molar mass of NaCl determined by colligative property measurement will be

    A
    equal to 58.5
    B
    `gt58.5`
    C
    `lt 58.5`
    D
    can't be measured

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