Explanation
H3PO4 being a tribasic , it has 1,2,3 values as a n-factor . Hence its normality will be the product of n-factor with molarity . Hence , it has normality 0.25N , 0.50 N and 0.75 N.
Molarity is affected by temperature because it is based on the volume of the solution and the volume of a substance will be affected by changes in temperature.
When the cohesive forces between like molecules are greater than the adhesive forces between dissimilar molecules, the dissimilarities of polarity leads both components to escape solution more easily. Therefore, the vapor pressure is greater than expected from the Raoult's law, showing positive deviation. If the deviation is large, then the vapor pressure curve shows a maximum at a particular composition and form a positive azeotrope.
Hence acetone (CH3COCH3) and carbon disulphide (CS2) shows a positive deviation from the Raoult's law.
Given Binary solution slows negative deviation froms Rasoult’s law
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