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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
When $KMn{O_4}$ reacts with acidified $FeS{O_4}$
  • A
    Only $FeS{O_4}$ is oxidised
  • B
    Only $KMn{O_4}$ is oxidised
  • ✓
    $FeS{O_4}$ is oxidised $KMn{O_4}$ and is reduced
  • D
    None of these
✓

Answer

Correct option: C.
$FeS{O_4}$ is oxidised $KMn{O_4}$ and is reduced
c
(c)$FeS{O_4}$is oxidised and $KMn{O_4}$ is reduced.

In this reaction oxidation state of $Mn$ is changing from $+7 $ to $+2 $ while oxidation state of $Fe$ is changing from $+2 $ to $ +3.$ 

$2KMn{O_4} + 3{H_2}S{O_4}\, \to \,{K_2}S{O_4} + 2MnS{O_4}$

$[2FeS{O_4} + {H_2}S{O_4}\, \to \,F{e_2}{(S{O_4})_3} + 2H] \times 5$

$[2H + [O]\, \to \,{H_2}O] \times 5$

$\overline {2KMn{O_4} + 8{H_2}S{O_4} + 10FeS{O_4}{\mkern 1mu}  \to } $

${K_2}S{O_4} + 2MnS{O_4} + 5F{e_2}{(S{O_4})_3} + 8{H_2}O$

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