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Explain - Vapour phase refining is used ...

Explain - Vapour phase refining is used for purification of Ti.

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Explain (i) Zone refining

Two liquids A and B have vapour pressure in the ratio P_A^@:P_B^@ =2:3 at a certain temperature. Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase in 1:3,then the mole fraction of A in the solution at the same temperature is :