List of top Chemistry Questions on Transition Elements asked in JEE Main

The correct order of first \((\Delta_iH_1)\) and second \((\Delta_iH_2)\) ionisation enthalpy values of Cr and Mn are:}

[A.] \( \Delta_iH_1: Cr>Mn \)
[B.] \( \Delta_iH_2: Cr>Mn \)
[C.] \( \Delta_iH_1: Mn>Cr \)
[D.] \( \Delta_iH_2: Mn>Cr \)

Which of the following is NOT a physical or chemical characteristic of interstitial compounds?

Given below are two statements:
Statement I: The number of pairs among [Ti⁴⁺, V²⁺], [V²⁺, Mn²⁺], [Mn²⁺, Fe³⁺] and [V²⁺, Cr²⁺] in which both ions are coloured is 3.
Statement II: The number of pairs among [La³⁺, Yb²⁺], [Lu³⁺, Ce⁴⁺] and [Ac³⁺, Lr³⁺] ions in which both are diamagnetic is 3.

The correct set of ions (aqueous solution) with the same colour from the following is:

A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential \( (M^{3+} / M^{2+}) \). It forms a metal complex of the type \( [M(CN)_6]^{4-} \). The number of electrons present in the \( e_g \) orbital of the complex is ________.

Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4d orbitals. The value of \( x + y \) is:

The spin-only magnetic moment value of the ion among \( \text{Ti}^{2+}, \text{V}^{2+}, \text{Co}^{3+}, \text{and} \, \text{Cr}^{2+} \), that acts as a strong oxidizing agent in aqueous solution is:\(\dots\) BM (Nearest integer).
Given atomic numbers: Ti: 22, V: 23, Cr: 24, Co: 27

The metal that shows highest and maximum number of oxidation state is: