Question

3. Aluminium is used as a reducing agent in the extraction of metals because
1) It is cheap 2) it has low ionization enthalpy 3) HⓇ of A1,0, is high
Ferric alum reacts with NaOH solution to form
4) it forms alloysre​

Answer 1

Answer:Aluminium is more electropositive than Cr or Mn.

Hence, aluminum metal is frequently used as reducing agent for the extraction of metal such as chromium or manganese from their respective oxides.

The process of reduction is known as Aluminothermy. Thermite mixture Fe

2

​

O

3

​

+Al in 3:1 ratio is used.

Cr

2

​

O

3

​

+2Al→Al

2

​

O

3

​

+2Cr

3Mn

3

​

O

4

​

+8Al→4Al

2

​

O

3

​

+9Mn

Explanation:

Answer 2

Answer:

AS IT HAS GREAT AFFINITY TOWARDS O2

Explanation:

AS IT HAS GREAT AFFINITY TOWARDS O2 AND IS USED TO REDUCE METAL OXIDES INTO METALS, WITH EVOLUTION OF A LOT OF HEAT