Question

Which of the following arragments does not respresent the correct order of the property stated against it ?
A. `Sc lt To lt Cr lt Mn :" ""number of oxidation states"`
B. `V^(2+) lt Cr^(2+) lt Mn^(2+) lt Fe^(2+):" "" paramagnetic behaviou"`
C. `Ni^(2+) lt Co^(2+) lt Fe^(2+) lt Mn^(2+):" "" Ionic size"`
D. `Co^(3+) lt Fe^(3+) lt Cr^(3+) lt Sc^(3+):" ""stability in aquesous"`

Answer 1

Correct Answer - B
The unparied electrons in `Fe^(2+)` ion (four) are less than in `Mn^(2+)` ion (five).
` Fe^(2+)` ion less paramagnetic than `Mn^(2+)` ion. The correct order is:
`V^(2+) lt Cr^(2+) lt Fe^(2+) lt Mn^(2+)`