Q. 26 B5.0( 3 Votes )

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Answer :

Given:

Kf = 3.83 K kg/mol


Mass of solute = 2.56g


Mass of solvent = 100g


Therefore, Molality of the solution,


The depression in freezing point of a solution, ΔTf = iKfm


0.383 = i x 3.83 x 0.8


i = 1/8


Hence 8 small sulphur atoms undergo association. Hence formula of Sulphur is S8.


B. (i) Since 1.2% sodium chloride solution is hypertonic wrt 0.9% sodium chloride solution, when the blood cells are placed in 1.2% sodium chloride solution, water flows out of the cells and the cells shrink.


(ii) Since 0.4% sodium chloride is hypotonic wrt 0.9% chloride solution, when the blood cells are placed in 0.4% sodium chloride solution, water flows in to the cells and the cells swell.


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