(a) Name the metal which is extracted from the ore called ‘rock salt’.(b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
(c) Explain how, mercury is extracted from its sulphide are (cinnabar). Give equations of the reactions involved.
(d) In the electrolytic refining of a metal M, what would you take as anode, cathode and electrolyte?
(e) Name any five metals which are purified by electrolytic refining method.
(a) Sodium is extracted from the ore called ‘rock salt’.
(b) (i) Calamine is the ore of zinc. Zinc carbonate, ZnCO3 is present in it.
(ii) Zinc blende is the ore of zinc. Zinc sulphide, ZnS is present in it.
(c) Mercury (II) sulphide ore is roasted in the air when mercury (II) oxide is formed which further decomposes to produce mercury and oxygen.
$2HgO → 2Hg(l) + O_2(g)$
(d) In the electrolytic refining of a metal M
Anode: Thick block of impure metal M
Cathode: Thin strip of pure metal M
Electrolyte: Water-soluble salt (of metal M).
(e) Five metals that are purified by electrolytic refining method are:
(i) Copper
(ii) Zinc
(iii) Nickel
(iv) Gold
(v) Silver
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- What is meant by refining of metals? In the electrolyte refining of metal M, name the cathode, anode and the electrolyte.
- (a) Name the method by which aluminium metal is extracted.(b) Give the name and chemical formula of one ore of copper. (c) How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
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- A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.(a) Name the metal and write its chemical symbol. (b) Write the name and formula of the sulphide ore. (c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore. (d) Name a common device in which this metal is used. (e) Can this metal displace copper from copper sulphate solution? Why?
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- Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
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- (i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.(a) Roasting of copper(I)sulphide(b) Reduction of copper(I)oxide with copper(I)sulphide.(c) Electrolytic refining.(ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.
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- (a) Define non-metals. Give five examples of non-metals.(b) Name a non-metal which conducts electricity. (c) Name a non-metal having lustre (shining surface). (d) Name a non-metal which is extremely hard. (e) How do non-metals react with oxygen? Explain with an example. Give equation of the reaction involved. What is the nature of the product formed ? How will you demonstrate it?
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