1.

Explain the extraction of metals low in activity series.

Answer»

Solution :Metals placed low in the activity series are not very active. The oxides of these metals can be EASILY reduced to metals by heating only. When the sulphide ores of these metals are heated in air, these GET converted into oxides. On further heating metal oxides can be reduced to metals.
(a) MERCURY (Hg)
`2HgS+3O_(2)(G)overset("Heat")to2HgO(s)+2SO_(2)(g)`
`2HgO(s)overset("Heat")to2Hg(1)+O_(2)(g)`
(b) COPPER (Cu)
`2Cu_(2)S+3O_(2)(g)overset("Heat")to2Cu_(2)O(s)+2SO_(2)(g)`
`2Cu_(2)O+Cu_(2)Soverset("Heat")to6Cu(s)+SO_(2)(g)`


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