Q19 of 30 Page 246

With the help of an example explain how one can separate two sulphide ores by Froth Floatation method.

To separate two sulphide ores for example there is an ore containing zinc sulphide and lead sulphide so when we add depressant that is NaCN or KCN then this selectively allows lead sulphide to come with the froth and prevents zinc sulphide to come with the froth.



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17

Components of a binary mixture of two liquids A and B were being separated by distillation. After some time separation of components stopped and composition of vapour phase became same as that of liquid phase. Both the components started coming in the distillate. Explain why this happened.

 18

Identify the cathode and anode in the cell written below.

Cu | Cu2+ || Cl– | Cl2 , Pt


Write the reduction half reaction and oxidation half reaction of the cell.


 20

White phosphorus reacts with chlorine and the product gets hydrolysed in the presence of water to produce HCl. Calculate the mass of HCl obtained by the hydrolysis of the product formed by the reactions of 62 g of white phosphorus with chlorine in the presence of water.

 21

A coordination compound CrCl3 .4H2O precipitates AgCl when treated with AgNO3. The molar conductance of the solution of coordination compound corresponds to a total of two ions. Write structural formula of the compound and name it.