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For different aqueous solutions of 0.1N ...

For different aqueous solutions of `0.1N` urea, `0.1N NaCl, 0.1N Na_(2)SO_(4)` and `0.1N Na_(3)PO_(4)` solution at `27^(@)C`, select the correct statements:

A

The order of osmotic pressure is:
`NaCl gt Na_(2)SO_(4) gt Na_(3)PO_(4) gt "urea"`

B

`pi = (Delta T_(b))/(K_(b)) xx ST` for urea solution

C

Addition of salt on ice increases its melting point

D

Addition of salt on ice brings in melting of ice earlier

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
Molar concentration are `0.1 M` urea, `0.1 M NaCl`,
`(0.1)/(2) M Na_(2)SO_(4)` and `(0.1)/(3)M Na_(3)PO_(4)`
`:. pi prop CX (1-alpha +Xalpha +Y alpha) prop C(X+Y)`,
if `alpha = 1`
`:. pi_("urea") prop 0.1 xx 1, pi_(Na_(3)PO_(4)) prop (0.1)/(3) xx 4`
Also `pi = C_(M) xx S xx T`
and `Delta T_(b) = "Molality" xx K_(b)`
If Molality `=` Molality (for dilute solution)
`pi = (Delta T_(b))/(K_(b)) xx S xx T`
Also addition of salt on ice lowers its melting point and thus, ice melts earlier.
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