Question

The oxidation state of Iron in Mohr's salt is +2, the oxidation state of Iron after completion of titration is
a.+1
b.+2
c.+3
d.+4​

Answer 1

Answer:

Why do we heat oxalic acid solution containing sulphuric acid up to 50–60°C in the permanganate titration? The oxidation number of iron in Mohr's salt is +2. Iron is oxidised during the reaction and its oxidation number changes from +2 to +3.

Explanation:

ans:+2

Answer 2

The oxidation state of Iron after completion of titration c) +3.

• Mohr's salt is used in titration reactions and acts as a reducing agent.
• In this titration generally, KmnO4 is used as an oxidising agent.
• It means oxidation of mohrs salt occurs whereas reduction of Kmno4 occurs.
• The formula of mohrs salt is FeSO4. (NH4)2SO4. 6H2O.so, the oxidation state of iron in mohrs salt is +2.
• After titration Fe2+ ion is oxidised to Fe3+ whereas Mn+7 is reduced to Mn2+ ion and the colour of the solution changes from pink to colourless.