Question

Which option is not matched in correct sequence:

• A. $d^{5},d^{3},d^{1},d^{4} \rightarrow $ increasing magnetic moment
• B. $MO,M_{2}O_{3},MO_{2},M_{2}O_{5} \rightarrow $ decreasing basic strength
• C. $Sc,V,Cr,Mn$ $ \rightarrow $ increasing number of oxidation state
• D. $Co^{2 +},Fe^{+ 3},Cr^{+ 3},Sc^{+ 3} \rightarrow $ increasing stability of ions

Answer 1

Answer: (A)

A. As Increasing order of magnetic moment will be $d^{1},d^{3},d^{4},d^{5}$ so this one is not correct. Magnetic moment is more for more number of unpaired electrons.
B. As the oxidation state of metal increases, acidic strength increases so, this one is correctly matched.
C. Mn has the highest oxidation state of +7
Half-filled and full-filled sub-orbits are extra stable.