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05/11/2020 4:52 pm
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(a) Name the main ore of mercury. How is mercury obtained from its ore? Give balanced chemical equation.
(b) What is thermite reaction? How is it used to join the railway tracks or cracked machine parts?
(c) Name the method used to extract metals of high reactivity.
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05/11/2020 4:55 pm
(a) Cinnabar
Mercury is obtained from its ore by roasting.
HgS + O2 → Hg + SO2
(b) When aluminium is heated with Fe2O3 to get molten iron, it is called thermite reaction.
Fe2O3 + 2Al → Al2O3 + 2Fe
Molten iron is used to weld broken railway tracks.
(c) Electrolytic reduction