MCQ
The pair of compounds having metals in their highest oxidation state is
- ✓$MnO_4 ^-$ and $CrO_2Cl_2$
- B$[NiCl_4]^{2-}$ and $[CoCl_4]^{2-}$
- C$[Fe(CN)_6]^{3-}$ and $[Cu(CN)_2]^{2-}$
- D$[FeCl_4]^-$ and $Co_2O_3$
✓
Answer
Correct option: A.
$MnO_4 ^-$ and $CrO_2Cl_2$
a
$(1)\,Cr\mathop {{O_2}}\limits^{2 - } \mathop {C{l_2}}\limits^{ - 1} \,\,Cr = + 6;\,Mn\mathop {{O_2}}\limits^{2 - } \,\,Mn = + 4$
$(1)\,Cr\mathop {{O_2}}\limits^{2 - } \mathop {C{l_2}}\limits^{ - 1} \,\,Cr = + 6;\,Mn\mathop {{O_2}}\limits^{2 - } \,\,Mn = + 4$
(Highest oxidation state)
$(2)\,{[Ni\mathop {C{l_4}}\limits^{ - 1} ]^{2 - }}\,\,Ni = + 2;\,{[Co\mathop {C{l_4}}\limits^{ - 1} ]^{2 - }}\,\,Co = + 2$
$(3)\,{[Fe{(\mathop {CN}\limits^{ - 1} )_6}]^{3 - }}\,\,Fe = + 3;\,{[Cu{(\mathop {CN}\limits^{ - 1} )_4}]^{2 - }}\,\,Cu = + 2$
$(4)\,{[Fe\mathop {C{l_4}}\limits^{ - 1} ]^ - }\,\,Fe = + 3;\,C{o_2}\mathop {{O_3}}\limits^{ - 2} \,Co = + 3$
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