List of top Chemistry Questions on Transition Elements asked in CBSE CLASS XII

Out of the following statements, the incorrect statement is:

Give explanation for each of the following observations:

(a) With the same d-orbital configuration (d4), Mn3+ ion is an oxidizing agent whereas Cr2+ ion is a reducing agent.

(b) Actinoid contraction is greater from element to element than that among lanthanoids.

(c) Transition metals form a large number of interstitial compounds with H, B, C, and N.

Why do transition metals and their compounds show catalytic activities?
How can you obtain potassium dichromate from sodium chromate?
Predict which of the following will be coloured in aqueous solution and why? 
\(Sc^{3+}, Fe^{3+}, Zn^{2+}\)
[Atomic numbers: Sc = 21, Fe = 26, Zn = 30]
Write the general electronic configuration of f-block elements.
\( E^0 \) value of Cu\(^{2+}\)/Cu is \( +0.34 \) V.
Write the structures of A and B in the following reaction: \[ \text{C}_6\text{H}_5\text{COOH} \xrightarrow{\text{NH}_3, \Delta} A \xrightarrow{\text{Br}_2/\text{NaOH}} B \]
Complete the following reaction: \[ \text{C}_6\text{H}_5\text{N}_2^+Cl^- \xrightarrow{\text{ HBF}_4} \xrightarrow{\text{ NaNO}_2/\text{Cu}, \Delta} \quad ? \]