Question

_______ being highly reactive is used in the extraction of chromium and manganese.

• A. $Al$
• B. $Zn$
• C. $Cu$
• D. $Mg$

Answer 1

Answer: (A)

$Al$

Answer 2

The highly reactive metal such as aluminium is used as reducing agents because they can displace metals of lower reactivity from their compounds. For example, when manganese dioxide is heated with aluminium powder, the following reaction takes place: $3 MnO 2( s )+4 Al ( s ) \rightarrow 3 Mn ( l )+2 Al 2 O 3( s )+$ Heat