15. Give reasons: a. Gold and silver are found in their free state. b. Sodium is never found in its free state. c. The sulphide ore is converted into an oxide for the extraction of metals. d. The oxides of metals like Hg can be reduced by heating only. e. The oxides of metals like Na, Mg , Ca cannot be reduced by carbon 16. Name two metals that can be refined by electrolysis.
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Explanation:
a. Gold and silver are least reactive so they are kept in their free state.
b. Sodium is very reactive to the atmosphere hence its not kept in its free state.
c. Sulphide ore is converted as it is very easy to extract
d. As it cant be reduced through any other methods it is reduced through heating. Moreover Hg is a strong metal.
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