Question

Name the reducing agent in the following reaction: 3MnO2 + 4Al → 3Mn + 2Al2O3 state which is more reactive Mn or Al and why.... give me correct answer...​

Answer 1

Reducing agent remove oxygen from other compounds or add oxygen to itself therefore the reducing agent here is aliminium.

Answer 2

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Answer

Al is ‘more reactive’ than Mn as it replaces the Mn from its compound .

3MnO2 + 4AL ------> 3Mn + 2AL2O3

Here  changes to Mn. The ‘oxidation number’ of Mn in  is +4 whereas the oxidation number of Mn is zero. Hence the change in oxidation number occurs from +4 to 0. Overall oxidation number decreases hence it is reduction and  is called as oxidizing agent.

On the contrary, the oxidation number of Al is zero and it changes to +3 in . Hence the ‘oxidation number increases’ so it is an oxidation reaction and Al is a reducing agent.