Which of the following arrangements does not represent the correct order of the property stated against it?A. `V^(2+)ltCr^(2+)ltMn^(2+)ltFe^(3+)` paramagnetic behaviourB. `Ni^(2+)ltCo^(2+)ltFe^(2+)ltMn^(2+)` ionic sizeC. `Co^(3+)ltFe^(3+)ltCr^(3+)ltSc^(3+)` stability in aqueous solutionD. `Sc lt Ti lt Cr lt Mn ` number of oxidation states

Which of the following arrangements does not represent the correct ord

1.	Which of the following arrangements does not represent the correct order of the property stated against it?A. `V^(2+)ltCr^(2+)ltMn^(2+)ltFe^(3+)` paramagnetic behaviourB. `Ni^(2+)ltCo^(2+)ltFe^(2+)ltMn^(2+)` ionic sizeC. `Co^(3+)ltFe^(3+)ltCr^(3+)ltSc^(3+)` stability in aqueous solutionD. `Sc lt Ti lt Cr lt Mn ` number of oxidation states
Answer» Correct Answer - A (a)`V^(2+)=3` unpaired electrons `Cr^(2+)=4` unpaired electrons `Mn^(2+)=5` unpaired electrons `Fe^(3+)=4` unpaired electrons Hence, the order of paramagnetic behaviour should be `V^(2+) lt Cr^(2+)=Fe^(2+) lt Mn^(2+)`(b) Ionic size decreases from left to right in the same period. (c)`Co^(3+)//Co^(2+)=1.97Fe^(3+)//Fe^(2+)=0.77` `Cr^(3+)//Cu^(2+)=-0.41` Hence, stability increases as `Co^(3+) lt Fe^(3+) lt Cr^(3=) lt Sc^(3+)`. (d) The oxidation states increases as we go from group 3 to group 7 in the same period .