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The d & f Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements5 Marks
Question
Match the statements given in Column $I$ with the oxidation states given in Column II.
  Column $I$   Column $II$
$(i)$ Oxidation state of Mn in $MnO2$ is $(a)$ $+2$
$(ii)$ Most stable oxidation state of $Mn$ is $(b)$ $+3$
$(iii)$ Most stable oxidation state of $Mn$ in oxides is $(c)$ $+4$
$(iv)$ Characteristic oxidation state of lanthanoids is $(d)$ $+5$
    $(e)$ $+7$
✓

Answer

 
Column $I$
 
Column $II$
$(i)$
Oxidation state of Mn in $MnO2$ is
 $(c)$ $+4$
$(ii)$
Most stable oxidation state of $Mn$ is
 $(a)$ $+2$
$(iii)$
Most stable oxidation state of $Mn$ in oxides is
 $(e)$ $+5$
$(iv)$ Characteristic oxidation state of lanthanoids is $(b)$ $+3$
Explanation:
  1. Oxidation state of Mn in $MnO_2$ is $+4$
  2. Most stable oxidation state of $Mn$ is $+2$
  3. Most stable oxidation state of $Mn$ in oxides is is $+7$
  4. Characteristic oxidation state of lanthanoid is $+3$

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