Sc(Z = 21) is a transition element but Zn (Z = 30) is not because :
- Both $Sc^{3+}$ and $Zn^{2+}$ ions are colourless and form white compounds
- In case of $Sc, 3d$ orbitals are partially filled but in $Zn$ these are filled
- Last electron is assumed to be added to 4s level in case of Zn
- Both Sc and Zn do not exhibit variable oxidation states
The Correct Option is B
Solution and Explanation
Top Questions on d -and f -Block Elements
- Why is the ability of oxygen greater than fluorine to stabilise higher oxidation states of transition metals?
- CBSE CLASS XII - 2025
- Chemistry
- d -and f -Block Elements
- How do you prepare potassium manganate from pyrolusite ore?
- CBSE CLASS XII - 2025
- Chemistry
- d -and f -Block Elements
- Out of KMnO$_4$ and K$_2$MnO$_4$, which one is paramagnetic and why?
- CBSE CLASS XII - 2025
- Chemistry
- d -and f -Block Elements
- Assertion (A): First ionisation enthalpy of Cr is lower than that of Zn.
Reason (R): Zinc is a non-transition element.- CBSE CLASS XII - 2025
- Chemistry
- d -and f -Block Elements
- With increase in atomic number, the melting point of transition metals :
- CBSE CLASS XII - 2025
- Chemistry
- d -and f -Block Elements
Questions Asked in NEET exam
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :
- NEET (UG) - 2025
- Moment Of Inertia
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
- Current electricity
- If the rate constant of a reaction is 0.03 s$^{-1}$, how much time does it take for a 7.2 mol L$^{-1}$ concentration of the reactant to get reduced to 0.9 mol L$^{-1}$?
(Given: log 2 = 0.301)- NEET (UG) - 2025
- Chemical Kinetics
- The plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant \(K_1\) and \(K_2\) with thickness \(d/2\) and \(d/2\) respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If \(K_1 = 1.25 K_2\), the value of \(K_2\) is :
- NEET (UG) - 2025
- Capacitors and Capacitance
- A wire of resistance \(R\) is cut into 8 equal pieces. From these pieces, two equivalent resistances are made by adding four of these together in parallel. Then these two are added in series. The net effective resistance of the combination is:
- NEET (UG) - 2025
- Resistance
Concepts Used:
D and F Block Elements
The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.
They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.
Read More: The d and f block elements