List of top Chemistry Questions on Transition Elements

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 ________.

Write the reducing agents used to convert Fe\(_2\)O\(_3\) to ‘Fe’ in the reduction zone of blast furnace. Write chemical equations involved in : (i) Carbylamine reaction for ethylamine. (ii) Hoffmann Bromamide degradation for acetamide.
Write the general electronic configuration of 3d series. Draw the structures of sulphuric acid and thiosulphuric acid.
For the second and third row of transition elements, which statement is not true?

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.

Out of the following statements, the incorrect statement is:
Which of the following elements exhibits variable oxidation states and forms colored compounds?
Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4d orbitals. The value of \( x + y \) is: 
Write the structures of A and B in the following reaction: \[ \text{C}_6\text{H}_5\text{COOH} \xrightarrow{\text{NH}_3, \Delta} A \xrightarrow{\text{Br}_2/\text{NaOH}} B \]
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:
The maximum oxidation state of chromium is
Which of the following has the maximum number of unpaired electrons?
The number of unpaired electrons in \( \text{Cu}^{2+} \) ion (Z = 29) is
How can you obtain potassium dichromate from sodium chromate?
Which transition metal does not form ‘MO’ type oxide? (M = transition metal)

Match List I with List II

List I (Ions)List II (Magnetic moment (BM))
A. Co2+I. 1.73
B. Mn2+II. 3.87
C. Cr2+III. 4.90
D. Cu2+IV. 5.92

Choose the correct answer from the options given below:

The compounds of \( \text{Ti}^{4+} \) ions are colourless due to ___________.

\( E^0 \) value of Cu\(^{2+}\)/Cu is \( +0.34 \) V.
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]
Why do transition metals and their compounds show catalytic activities?
Write the general electronic configuration of f-block elements.
Complete the following reaction: \[ \text{C}_6\text{H}_5\text{N}_2^+Cl^- \xrightarrow{\text{ HBF}_4} \xrightarrow{\text{ NaNO}_2/\text{Cu}, \Delta} \quad ? \]
The spin only magnetic moment of Mn\(^{2+}\) ion is: