Q. The pair of compounds having metals in their highest oxidation state is
A) ${MnO}_{2},\ {FeCl}_{3}$
B) $\left\lbrack {MnO}_{4} \right\rbrack^{-},{CrO}_{2}{Cl}_{2}$
C) $\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}\ ,\lbrack Co(CN)_{3}\rbrack$
D) $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}\ ,\left\lbrack {CoCl}_{4} \right\rbrack^{-}$
Explanation
(b)
(a) In ${MnO}_{2},\ {FeCl}_{3}$oxidation states of Mn and Fe are +4 and +3 respectively.
(b) In ${({MnO}_{4})}^{-},{CrO}_{2}{Cl}_{2}$ oxidation states of Mn and Cr are +7 and +6 respectively.
(c) In $\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}\ ,\lbrack Co(CN)_{3}\rbrack$ oxidation states of Fe and Co are +3 and +3 respectively.
(d) $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}\ ,\left\lbrack {CoCl}_{4} \right\rbrack^{-}$ oxidation states of Ni and Co are +2 and +3 respectively.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.