Q15 of 26 Page 1

(i) Name the method used for the refining of Zirconium.

(ii) What is the role of CO in the extraction of Iron?


(iii) Reduction of metal oxide to metal becomes easier if the metal obtained in liquid state. Why?


(i) Van arkel method is used for the refining of zirconium. in this method the metal is heated with volatile iodine in evacuated vessel.


(ii) Carbon monoxide acts as an reducing agent Which reduces heamatite (iron ore) Fe2O3 to iron metal Fe.


(iii) In liquid , the entropy is higher than in solid. Which account for +ve ∆ S and more –vevalue∆ G°,and makes the reduction potential easier. Also the reduction is easier at high temperature. And liquid have higher temperature than solid.


More from this chapter

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13

Calculate emf of following cell at 298 K

Sn|Sn2+(0.001M)||H+(0.01M)||H2(g)(1bar)|Pt (s)


E°(Sn2+/Sn) = -0.14V


E ° (H+/H2) = 0.00V


 14

Give reason for following observation:

(i) Physisorption decrease with increase in temperature.


(ii) Addition of alum purifies the water.


(iii) Brownian movement provides stability to colloidal solution.


 16

(a) How would you account for the following :

(i) The chemistry of actinoids is more complicated as compare to lanthanoids.


(ii) Transition metal forms complex compounds.


(b) Complete the following reaction


2MnO4- + 6H+ + 5 S032-→


 17

(i) Draw the geometrical isomers of [Co(en)2Cl2]+

(ii) On the basis of CFT, write electronic configuration of d4 ion ∆° >P


(iii) [NiCl4]2- is paramagnetic whereas [Ni(C0)4]is a diamagnetic, though both are tetrahedral, why?(atomic no of Ni= 28)