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Existence of Metals

Chemical name...

Question

Chemical name of ore of Cu₂S ?

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Solution

chalcocite

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C u_{2} S

Q. (a) Which metal is extracted from calamine ore?
(b) Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
(c) How is copper extracted from its sulphide ore (copper glance), Cu₂S? Explain with equations of the reactions involved.
(d) What is an alloy? Give two examples of alloys.
(e) How are the properties of an alloy different from those of the constitutent elements?

Q. (a) Name the method of refining which is
(i) Used to obtain semiconductor of high purity.
(ii) Used to obtain low boiling metal.
(b) Write chemical reactions taking place in the extraction of copper from

C u_{2} S

Q. Skeleton equation of a chemical reaction is

C u_{2} S + C u S O_{4} \to C u + S O_{2}

Write its balanced chemical equation

The chemical name of main ore of iron is ___.

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