assertion the vapour pressure of a liquid if some non volatile solute is dissolved in it
reason the relative lowering of vapour pressure is a solution containing a nonvolatile solid is equal to more fraction of solute in solution
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CHEMISTRY
Assertion
Relative lowering of vapour pressure is equal to the mole fraction of the solvent
Reason
Relative lowering of vapour pressure is a colligative property
December 30, 2019avatar
Shrashti Lad
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ANSWER
Relative lowering of vapor pressure:
The vapor pressure of a liquid is the pressure of the vapor which is in equilibrium with that liquid. The vapor pressure of a solvent is lowered when a non-volatile solute is dissolved in it to form a solution.The reduction of vapor pressure of solvent is given as
p
1
=x.p
1
0
p
1
is vapor pressure of the solution.
p
1
0
is the vapor pressure of pure solvent
x is the mole fraction of solute
Relative lowering of vapor pressure is p
1
/p
1
0
=x
Where x is mole fraction of solute and not solvent. Statement 1 is false.
Relative lowering of vapor pressure is a colligative property.