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If air is taken as a binary solution, th...

If air is taken as a binary solution, the solvent is

A

`N_2`

B

`O_2`

C

`CO_2`

D

`H_2`

Text Solution

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The correct Answer is:
A
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Identify the solvent.

7g of a solute are dissolved in 200 g of a solvent (mol. Wt. 78) to prepare a solution. At a certain temperature dry air is sent into a solution and solvent continuously. The loss is weights of containers containing solutions and solvent are 0.975 g and 0.025 g. Calculate the molar mass of solute.

Knowledge Check

  • If air is taken as a binary solution, the solved is

    A
    `n_(2)`
    B
    `O_(2)`
    C
    `CO_(2)`
    D
    `H_(2)`

  • Equal masses of a solute are dissolved in equal amount of two solvents A and B respective molecular masses being M_(A) and M_(B) . The relative lowering of vapour pressure of solution in solvent A is twice that of the solution in solvent B. If the solutions are dilute , M_(A) and M_(B) are related as

    A
    `M_(A)=M_(B)`
    B
    `2M_(A)=M_(B)`
    C
    `M_(A)=2M`
    D
    `M_(A)=4M_(B)`

  • The vapour pressure of a solvent is lowered by the presence of the non-volatile solute in the solution and this lowering of vapour pressure of the solvent is governed by Raoult's law , according to which the relative lowering of vapour pressure of the solvent over a solution is equal to the mole fraction of a non-volatile solute present in the solution. Howerver, in a case of binary liquid solution, if both the components of the solution are volatile then another from of Raoult's law is used . Mathematically, this from of the Raoult's can be given as: P_("total"=P_(1)^(0)X_(1)+P_(2)^(0)X_(2) . Solution which obey Raoult's law over the entire range of concentration are known as ideal solution . two types of deviation from Raoult's law, that is, positive and negative deviations are observed. Azeotrons arise due to very large deviation from Raoult's law . (When a plot of boiling point versus composition is plotted, then the type of grapgh that cannot be obtained is

    A
    B
    C
    D

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