Match the purification processes given in Column-I with the metal(s) given in Column-II.
Column-I | Column-II | ||
(a) | Poling | (p) | Titanium |
(b) | Cupellation | (q) | Copper |
(c) | Liquation | (r) | Silver |
(d) | Van Arkel method | (s) | Tin |
Text Solution
Verified by ExpertsA
(A → q,s) ; (B → r) ; (C → s) ; (D → p)
Sol. Poling : Impure molten metal is stirred with green wood poles. The reducing gases liberated reduce the oxide of the metal to free metal. This method is used for the purification of those metals which contain the impurities of their own oxides. For example CuO in Cu and SnO 2 in tin.
Cupellation : It is used when impurities are of other metals and is mainly used for the removal of lead from silver.
Liquation : This process is used for the purification of the metal, which it self is readily fusible but the impurity present in it are not i.e. impurities are non-fusible. This process is used for purification of Sn and Zn.
Van Arkel method : (vapour phase refining) Metals like titanium, zirconium, thorium and uranium are purified by this method.
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