First slide

Uses of Boron & Aluminium

Question

In Gold Schmidt reaction, certain metallic oxides are reduced to the metallic state by heating with

Moderate

A

metallic magnesium
B

metallic aluminium
C

metallic iron
D

sodium metal

Solution

In aluminothermite process "Al" acts as reducing agent .
→ " Al "acts as strong reducing agent.
eg.,
$C{r_2}{O_3} + 2Al\xrightarrow{{}}2Cr + A{l_2}{O_3}$
${B_2}{O_3} + 2Al\xrightarrow{{}}2B + A{l_2}{O_3}$
${Mn_3}{O_4} + 8Al\xrightarrow{{}}9Mn + 4A{l_2}{O_3}$
ALUMINO THERMITE PROCESS
Mixture of metal oxide and Al powder in 3:1 ratio is called Thermite mixture.
Mixture of BaO₂ and Mg or Al powder is called ignition mixture.
Example for thermite mixture is, Fe₂O₃ and Al 3:1 ratio.
→ On burning of Mg-ribbon, it carries the flame into ignition mixture.Ignition mixture on ignition provides huge amount of energy.By using this energy Al of thermite mixture reduces the metal oxide to metal. The metal obtained in this process will be in liquid state .This formed liquid metal (Fe) is used for welding of train rails and welding of other metals.

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