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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
An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is $....\,B.M.$ (Nearest integer)
  • A
    $2$
  • B
    $56$
  • C
    $10$
  • ✓
    $0$
✓

Answer

Correct option: D.
$0$
d
$3 MnO _{4}^{2-}+4 H ^{+} \longrightarrow 2 MnO _{4}^{-}+ MnO _{2}^{+7}+2 H _{2} O$

$Mn ^{+7}=$ no. of unpaired electrons is $' 0 '$

$\mu=0\, \text { B.M. }$

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