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प्रश्न
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
उत्तर
Calamine, zinc carbonate ZnCO3 can be extracted by calcination. As zinc is moderately reactive and is placed at the middle of the reactivity series, it can be reduced by carbon. The steps involved in the extraction of zinc are:
1. Concentrated carbonate of zinc is converted to its oxide by calcination. In this process, zinc carbonate ore is strongly heated in the absence of air to produce zinc oxide and carbon dioxide gas.
2. Zinc oxide is then reduced by coke (carbon). When zinc oxide is heated with coke, carbon acts as a reducing agent and reduces zinc oxide to zinc.
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name the gas in air which tarnishes silver articles slowly.
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
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?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Froth floatation process is generally used to concentrate ______ ores.
_______ is the least reactive metal.
Write the molecular formulae of the following compound.
Fluorspar
