The aqueous solution containing which one of the following ions will be colourless?(Atomic no: Sc=21, Fe=26, Ti=22, Mn=25)
Sc3+
Fe2+
Ti3+
Mn2+
The Correct Option is A
Solution and Explanation
(a) \(_{21}Sc^{3+}\) = 1s2, 2s2, 2p6, 3s2, 3p6
Because there are no unpaired electrons in the d-subshell, it is colourless.
(b) \(_{26}Fe^{2+}\)= 1s2, 2p6, 3s2, and 3d6
The presence of four unpaired electrons in the d-subshell is what gives it its hue.
(c) \(_{22}Ti^{3+}\) =1s2,2s2, 2p6, 3s2, and 3p6
Because there is one unpaired electron in the d-subshell, it is coloured.
(d) \(_{25}Mn^{2+}\)= 1s2, 2s2, 2p6, 3s2, and 3p6 3d5.
It has colour because the d-subshell contains five unpaired electrons.
Therefore, the correct option is (A): Sc3+
Top Questions on d -and f -Block Elements
- Why do transition metals and their compounds act as good catalysts?
- CBSE CLASS XII - 2024
- Chemistry
- d -and f -Block Elements
- What is the cause of contraction in the atomic size of lanthanoids?
- CBSE CLASS XII - 2024
- Chemistry
- d -and f -Block Elements
- Define lanthanoid contraction. How does it affect the atomic radii of the third transition series and the second transition series?
- CBSE CLASS XII - 2024
- Chemistry
- d -and f -Block Elements
- Which of the following elements of the 3d series of transition elements has the lowest \(\Delta_{a} H^\circ\)?
- CBSE CLASS XII - 2024
- Chemistry
- d -and f -Block Elements
- A first row transition metal with the highest enthalpy of atomisation, upon reaction with oxygen at high temperature, forms oxides of formula \( \text{M}_2\text{O}_n \) (where \( n = 3, 4, 5 \)). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ___ BM (near integer).
(Given atomic number: \( \text{Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26, Co: 27, Ni: 28, Cu: 29, Zn: 30} \))- JEE Main - 2024
- Chemistry
- d -and f -Block Elements
Questions Asked in NEET exam
- Given below are two statements:
Statement I: Mitochondria and chloroplasts both double membranes bound organelles.
Statement II: Inner membrane of mitochondria is relatively less permeable, as compared chloroplast. I
In the light of the above statements, choose the mis appropriate answer from the options given below- NEET (UG) - 2024
- Cell structure and organelles
- The highest number of helium atoms is in
- NEET (UG) - 2024
- Electronic configuration of atoms and ions
- A light ray enters through a right angled prism at point P with the angle of incidence 30° as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the prism is :
- NEET (UG) - 2024
- Refraction Through A Prism
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
- The products A and B obtained in the following reactions, respectively, are
3ROH+PCI3→3RCI+A
ROH+PCI5→RCI+HCI+B- NEET (UG) - 2024
- Chemical Reactions
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