List of top Chemistry Questions on Metals and Non-Metals asked in JEE Main

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ion (M$^{n+}$) exists in green colour. The nature of the oxide formed by the above M$^{n-}$ ion is:
The number of valence electrons present in the metal among Cr, Co, Fe, and Ni which has the lowest enthalpy of atomisation is
Which of the following ions shows spin only magnetic moment of 4.9 B.M.?
Which of the following is correct?