Q17 of 46 Page 1

Write the principle of the following:

(a) Hydraulic Washing


(b) Chromatography


(c) Froth- floatation process


(a) Hydraulic Washing is based on the difference in specific gravities of minerals and impurities. In this, powdered ore is washed in a stream of running water so that lighter impurities are washed away leaving behind the mineral.


(b) Chromatography is based on the principle that dfferent components of a mixture are differently adsorbed on an adsorbent.


(c) Froth- floatation process is used for the concentration of sulphide ores based on difference in wettability of mineral and impurities. Ore particles are preferentially wetted by oil while impurities are by water.


More from this chapter

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10

Define the following terms with suitable examples of each:

(a) Polydentate ligand


(b) Homoleptic complex


OR


Using IUPAC norms, write the formulae for the following complexes:


(a) Potassium tri(oxalato)chromate(III)


(b) Hexaaquamanganese(II) sulphate


 14

(a) Write the dispersed phase and dispersion medium of butter.

(b) Why does physisorption decrease with increase in temperature?


(c) A colloidal sol is prepared by the given method in figure. What is the charge on AgI colloidal particles formed in the test tube? How is this sol represented?


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 18

Give reasons for the following:

(a) Transition metals have high enthalpies of atomization.


(b) Manganese has a lower melting point even though it has a higher number of unpaired electrons for bonding.


(c) Ce4+ is a strong oxidizing agent.


 19

Write the structure of Monomers used for getting the following polymers:

(a) Novolac


(b) Neoprene


(c) Buna - S


OR


(a) Write one example each of


(i) Cross-linked polymer.


(ii) Natural Polymer


(b) Arrange the following in the increasing order of their intermolecular forces:


Terylene, Buna - N, Polystyrene


(c) Define biodegradable polymers with an example.