Question

33.A sample of Fe2+ ions is oxidized by x moles ofMnO4 ions in acidic medium. The moles of Cr_03-required to oxidize same amount of Fe2+ ions inacidic medium(1) 0.8 x(2)2.0 x(3) 3.0 x(4) 4.0 x​

Answer 1

Explanation:

MnO

4

−

is reduced to Mn

2+

.

MnO

4

−

→Mn

+2

It will oxidise only oxalate, (C

2

O

4

2−

) as iron is already in its highest oxidised state.

The reaction is as follows:

Fe

2

(C

2

O

4

)

3

⇌2Fe

3+

+3C

2

O

4

2−

At equivalent point, both reactant have same number of equivalents.

Therefore, one mole of MnO

4

−

will oxidise

6

5

moles of ferric oxalate.

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