1.

Which of the following solutions will exhibit highest boiling point ?

Answer»

`0.01 M Na_(2)SO_(4(aq))`
`0.01 M KNO_(3(aq))`
`0.015 "M urea"_((aq))`
`0.015"M glucose"_((aq))`

Solution :`Delta T_(b)=i. K_(b).m`
For `0.01 M Na_(2)SO_(4), Delta T_(b)=3xx0.01xx K_(b)`
`[Na_(2)SO_(4)to 2Na^(+)+SO_(4)^(2-), i=3]`
For `0.01M KNO_(3), Delta T_(b)=2xx0.01xx K_(b)`
`[KNO_(3)rarr K^(+)+NO_(3)^(-), i=2]`
For 0.015 M urea, `Delta T_(b)=0.015 xx K_(b)`[Urea is a NON electrolyte]
For 0.015 M glucose,`Delta T_(b)=0.015xxK_(b)` [Glucose is a non - electrolyte].


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