1.

Select the correct order of sizes for the following d-block elements.A. `Zr=Hf,Nb=Ta,Fe~=Co~=Ni`B. `Zr^(4+) lt Zr, Nb^(3+) lt Ta^(3+), Fe^(3+) lt Fe^(2+) lt Fe`C. `Zr^(4+)=Hf^(4+),Nb^(3+)=Ta^(3+),Fe lt Co lt Ni`D. `Zr^(4+) lt Hf^(4+),Nb^(3+)=Ta^(3+),Ni lt Cu lt Co`

Answer» Correct Answer - C
`Zr=Hf,Nb=Ta ` due to lanthanide contraction.
and `Fe=[Ar]3d^(6)4s^(2)`
`Co=[Ar]3d^(7)4s^(2)`
`Ni=[Ar]3d^(8)4s^(2)`


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