Q10 of 26 Page 1

(i) On mixing liquid X and liquid Y, the volume of the resulting solution increases. What type of deviation from Raoult’s law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y?

(ii) How can the direction of osmosis be reversed? Write one use of reverse osmosis.


(i) On mixing X and Y, if the volume of the resulting solution increases, it means that the interaction between the X-X and Y-Y molecules is greater than the intermolecular interactions between X and Y molecules. This leads to positive deviation from Raoult’s law. Due to the increase in vapour pressure, the boiling point of the solution decreases.


(ii) The process of osmosis that is the direction of flow of solvent can be reversed if a pressure greater than is applied on the solution side.


One use of reverse osmosis is to convert sea water into fresh water.


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8

Calculate the time to deposit 1.17 g of Ni at cathode when a current of 5 A was passed through the solution of Ni(NO3)2. (Molar mass of Ni = 58.5 g/mol, 1 F = 96500 C/mol)

 9

(i) Write down the IUPAC name of the following complex: K3[Fe(CN)6]

(ii) Write the formula for the following complex: Pentaamminenitrito-N-cobalt(III)


 11

(i) Which one of the following is an oligosaccharide: starch, maltose, fructose, glucose

(ii) Write one difference between DNA and RNA.


(iii) Write the name of the disease caused by the deficiency of Vitamin B1.


 12

Calculate E°cell for the following reaction at 25oC:

A + B2+(0.001 M) A2+(0.0001 M) + B


Given: Ecell = 2.6805, 1 F = 96500 C/mol