List of top Chemistry Questions on properties of d block elements asked in COMEDK UGET

Assertion (A): Mercury is not a transition element.
Reason (R): Mercury is a liquid metal.

The product and its colour when $\text{MnO}_2$ is fused with $\text{KOH}$ in presence of $\text{O}_2$:

Which of the following statement is correct?

Which of the following is an INCORRECT statement?

The correct order of spin-only magnetic moments among the following is: [Given: Atomic numbers: Mn = 25, Fe = 26, Co = 27]

Arrange the following ions in the decreasing order of covalent double bonds formed by the transition metal with oxygen. \[ A. = \text{chromate}, \quad B = \text{permanganate}, \quad C = \text{dichromate} \]

Which is the correct order of increasing number of unpaired electrons in the following ions?
\( A = \text{Cr}^{2+} \, (Z = 24), \quad B = \text{Cu}^{2+} \, (Z = 29), \quad C = \text{Ni}^{2+} \, (Z = 28), \quad D = \text{Fe}^{3+} \, (Z = 26) \)

The \( E^\circ \) values for \( \text{Cr}^{3+/2+} \), \( \text{Mn}^{3+/2+} \), \( \text{Fe}^{3+/2+} \), and \( \text{Co}^{3+/2+} \) are -0.41, +1.57, +0.77, and +1.97 V respectively. For which of these metals, the change in oxidation state from +2 to +3 is the easiest?