Which of the following is not correctly matched?

  • A
    $CrO_5$; oxidation number of $Cr = +10$
  • B
    $Fe_3O_4$; oxidation state of $Fe = +\frac{8}{3}$
  • C
    $Na-Hg$; oxidation number of $Na = +1$
  • D
    All of the above

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How many moles of acidic $KMnO_4$ are required to oxidize $1$ mole of ferrous oxalate $(FeC_2O_4)$?

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Assign $A, B, C, D$ from the given type of reaction.
$Mn(OH)_2 + H_2SO_4 \longrightarrow MnSO_4 + 2H_2O$

In which of the following conversions does a blue colour appear?

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