List of top Chemistry Questions on d -and f -Block Elements asked in JEE Main

For a metal ion magnetic moment is calculated to be 4.9BM. Find the number of unpaired.
For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.

Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are

The disproportionation of MnO42- in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (μ) value of B in BM is _______. (Nearest integer)
In following pairs, the one in which both transition metal ions are colourless is :
Find among the spin only magnetic moment (nearest integer) of M in MO42-, M being the atom having least atomic radii among Sc, Ti, V, Cr, Mn, Zn.