Which pair of the following metals are extracted just by heating with their sulphide ores in air?

Mercury and copper

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Mercury and magnesium

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Silver and mercury

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Iron and mercury

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Solution

The correct option is A Mercury and copper
The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are reduced without the use of any additional reducing agent. When they are heated in air, part of the ore converts into oxide which then reacts with remaining sulphide ore to give the metal and sulphur dioxide.

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Similar questions

The two metals which can be extracted just by heating their sulphides in the air are:
(a) sodium and copper (b) copper and aluminium
(c) potassium and zinc (d) mercury and copper

Q. Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the following is correct ?
I. Copper is extracted by the auto reduction of copper oxide by copper sulphide.
II. Aluminium cannot be obtained by chemical reduction due to its strong affinity for oxygen.
III. In electrometallurgy of

A l

, graphite is used as cathode to avoid reoxidation of

A l

into

A l_{2} O_{3}

by preventing formation of

O_{2}

.
IV. Sulphide ores of copper are difficult to be reduced than the oxide ores.

Q. Metals like copper, mercury and lead are obtained from their oxide ores by

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?

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 ore (cinnabar). Give equation of the reactions involved.
(d) In the electrolytic refining of a metal M, what would you tak eas anode, cathode and electrolyte?
(e) Name any five metals which are purified by electrolytic refining method.

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