Q.

Chemical reduction is used in the extraction of

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a

Chromium

b

Manganese

c

Copper

d

Iron

answer is A, B, C, D.

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Detailed Solution

Chemical reduction method can be used for the extraction of metals except highly reactive metals like Na, K, Ca, Al.

Cr2O3+2Al2Al2O3+2Cr;CuO+CCu+Co

3Mn3O4+8Al4Al2O3+9 Mn;Fe2O3+3C2Fe+3CO

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