When CINNABAR is heated in excess of air
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The cinnabar is heated in air to get oxide of the mercury which is then decomposed to pure metal on heating. Answer: When cinnabar is heated, pure mercury is obtained. Explanation:Cinnabar is the sulfide ore of mercury.
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cinnabar[HgS] is heated in air to get oxide of the mercury which is then decomposed to pure metal on heating.
Chemical equation:
2HgS + 3O2 -------------> 2HgO + 2SO2
2HgO ------------> 2Hg +O2
A far as strategic elements , they are the metals that are in short supply in a particular country which are needed to manufacture products that contribute to the nation's GDP or defence.
examples: Copper,Zinc, silver, lead, chromium, titanium etc
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