1.

Arrange the following solutions in increasing order of their osmotic pressures . (i)34.2 g/litre surcrose (ii)60 g/litre of urea (iii)90 g/litre of glucose (iv)58.5 g/litre of sodium chloride

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Solution :`"Osmotic pressure of a solution Is calculated with the help of Van't Hoff equation":pi=I MRT`
(a) `M=((34.2"g L"^(-1)))/((342"g mol"^(-1)))=0.1"mol L"^(-1)=0.1M`
`pi=i MRT=(1)XX(0.1M)xxRT=(0.1M)xxRT`
(b) `M=((60.0"g L"^(-1)))/((60"g mol"^(-1)))=0.1" mol L"^(-1)=1M`
`pi=i MRT=(1) xx(1 M)xxRT=(1M)xxRT`
(c) `M=((90.0"g L"^(-1)))/((180"g mol"^(-1)))=0.5" g mol"^(-1)=0.5 M`
`pi = i MRT = (1)xx(0.5M)xxRT=(0.5M)xxRT`
(d) `M=((58.5"g L"^(-1)))/((58.5"g mol"^(-1)))=1" mol L"^(-1)=1M`
`pi=iMRT=(2)xx(1M)xxRT=(2M)xxRT.`
`"CORRECT increasing order of osmotic pressure "= (a)lt (c) lt (b) lt (d).`


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