The d- and f- B...

Which of the following ion has magnetic moment 3.87 BM?

The correct order of spin -only magnetic moments among the following is :
(Atomic number : $$ Mn =25, Co + 27 , Ni = 28, Zn = 30) $$

The effect of lanthanoid contration in the lanthanid series of elements by and large means: 

A transition metal cation M$$^{2+}$$ has a magnetic moment $$\sqrt35$$. what is the atomic number of the metal?

Orbital angular momentum of $$ e^- $$ (last filled ) in Cr is 

An iron $$ _{25}Mn^{x+} $$ has the magnetic moment of 4.9 BM. What is the value of x ?

An orange solid (A) on heating gave a green residue (B), a colourless gas (C) and water vapour. The gas (C) on passing over heated Mg gave white solid (D) which on reaction with water gave a gas (E). The gas (E) forms white fumes with HCl.

The metal ion which is not colored is: 

The d-electronic configuration of $${ Cr }^{ 2+ },{ Mn }^{ 2+ },{ Fe }^{ 2+ }$$ and $${ Ni }^{ 2+ }$$ are $${ 3d }^{ 4 },{ 3d }^{ 5 },{ 3d }^{ 6 }$$ and $${ 3d }^{ 8 }$$ respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic character?

Which of the following lanthanum ions is diamagnetic?