InterviewSolution
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InterviewSolution
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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 solutionC. Addition of salt on ice increases its melting pointD. Addition of salt on ice brings in melting of ice earlier |
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Answer» Correct Answer - 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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