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The vapour pressure of pure liquid A is ...

The vapour pressure of pure liquid A is `10` torr and at the same temperature when `1` g solid B is dissolved in `20`g of A , its vapour pressure is reduced to`9.0`torr . If the molecular mass of A is `200`amu , then the molecular mass of B is

A

100 amu

B

90 amu

C

75 amu

D

120 amu

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • The vapour pressure of water at 20^(@)C is 17.54mm . When 20g of non - ionic substance is dissolved in 100g of water, the vapour pressure is lowered by 0.30mm . What is the molecular mass of the substance ?

    A
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    B
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    C
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    D
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  • The vapour pressure of ether at 20^(@)C is 442 mm. When 7.2 g of a solute is dissolved in 60 g ether, vapour pressure is lowered by 32 units. If molecular mass of ether is 74 then molecular mass of solute is:

    A
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    B
    150.35 g/mole
    C
    116.23 g/mole
    D
    190.26 g/mole

  • The vapour pressure of ether at 20^(@)C is 442 mm. When 7.2 g of a solute is dissolved in 60 g ether, vapour pressure is lowered by 32 units. If molecular mass of ether is 74 then molecular mass of solute is:

    A
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    B
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    C
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