Which of the following statement is wrong

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Calamine is a carbonate ore.

Van-Arkel method is used for refining zirconium

The ore zinc blende is concentrated by froth floatation process

The alloys German silver and U.K silver coin contains total 61% of silver

answer is D.

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Detailed Solution

The principal ore of zinc used for its extraction is Zinc blende (ZnS). As Zinc blende is a sulphide ore, the process used for its concentration is the Froth Floatation Method.

Van Arkel method is a metallurgical method used to refine zirconium and titanium metal by removing oxygen and nitrogen impurities. The method involves heating the impure metal with iodine in an evacuated vessel to form a volatile metal iodide, which is then decomposed on a tungsten filament at a high temperature to obtain the pure metal.

ZnCO₃ is a formula for Calamine.

German silver : Cu = 50%, Zn = 30%, Ni = 20%

UK silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper.

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