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(i) Name the method used to extract meta...

(i) Name the method used to extract metals of high reactivity.
(ii) Name the main ore of mercury. How is mercury obtained from its ore ? Give balanced chemical equations.
(iii) Explain what is thermite reactions with the help of balanced equation. How is it used join railway tracks or cracked machine parts ?

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(a) Electrolytic reduction.
(b) Cinnabar (HgS)
By roasting and then self reduction
`2HgS + 3O_(2) overset("Heat")rarr 2HgO + 2SO_(2)`
`2HgO overset("Heat")rarr2Hg + O_(2)`
(c ) Reaction of `Fe_(2)O_(3)` with Al is used to join railway tracks and machine parts as it is exotermic.
This reaction is known as thermite reaction.
`Fe_(2)O_(3) + 2Al rarr 2Fe + Al_(2)O_(3) + "Heat"`
The amount of heat evolved is so large that the metal (Fe) is produced in the molten state.
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OSWAAL PUBLICATION-METALS AND NON-METALS-TOPIC - 2 Long Answer Type Questions
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