Free Electronic Structure of d-Block Elements MCQs with Answers
154 Electronic Structure of d-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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154 questions · page 8 of 8
- A. +2
- B. +5
- C. +7
- D. +8
Explanation: The highest oxidation state of manganese in its compounds is +7. In this oxidation state, manganese forms compounds like potassium…
Correct answer: +7- A. 1s2 2s2 2p6 3s2 3p6 3d8 4s2
- B. 1s2 2s2 2p6 3s2 3p6 3d7 4s2 4p1
- C. 1s2 2s2 2p6 3s2 3p6 3d6 4s2 4p2
- D. 1s2 2s2 2p6 3s2 3p6 3d6 4s1 4p3
Explanation: The correct electronic configuration for Nickel (28) is 1s2 2s2 2p6 3s2 3p6 3d8 4s2.
Correct answer: 1s2 2s2 2p6 3s2 3p6 3d8 4s2- A. Unpaired d Electrons
- B. Unpaired p electrons
- C. Unpaired f electrons
- D. Paired up d electrons
Explanation: Transition elements exhibit variable oxidation states due to the involvement of their ns and (n-1) d electrons.
Correct answer: Unpaired d Electrons- A. Two of its atoms
- B. Three of its atoms
- C. Four of its atoms
- D. Six of its atoms
Explanation: When this ion bonds to a metal atom, the two N atoms, and four of the O atoms, are used.
Correct answer: Six of its atoms- A. Open hearth furnace
- B. Reverberatory furnace
- C. Bessemer converter
- D. Blast furnace
Explanation: A puddling furnace is used which is a type of an open hearth furnace, it is constructed to pull hot air over the iron without the fuel…
Correct answer: Open hearth furnace- A. Iron
- B. Nickel
- C. Cobalt
- D. Barium
Explanation: Barium is not a ferromagnetic material. Ferromagnetic materials have a strong magnetic response to an external magnetic field, and they…
Correct answer: Barium- A. [Cr (H2 O)5Cl] Cl3
- B. [Cr (H2 O)5Cl] Cl2
- C. [Cr (H2 O)5 Cl2] Cl
- D. [Cr (H2 O)5 Cl3] Cl
Explanation: 'Chloro' in the name suggests the presence of one chlorine in the ligand complex, Penta (5) aqua (H2O) shows that there are five water…
Correct answer: [Cr (H2 O)5Cl] Cl2- A. Cr2+, Co2+, Cu2+
- B. Cu2+, Zn2+, Ti4+
- C. Ti3+, Zn2+, Cu2+
- D. Cr3+, Ti4+, Cu2+
Explanation: The correct answer is Option A: Cr2+, Co2+, Cu2+. These transition metal ions possess unpaired d-electrons, allowing for d-d electronic…
Correct answer: Cr2+, Co2+, Cu2+- A. [Cu(H2O)2 (NH3)2 (OH)2]
- B. [Cu(NH3)4 (OH)2]
- C. [Cu (NH3)4 (H2O)2]2+
- D. [Cu (NH3)3 (H2O)3]2+
Explanation: Ammonia acts as a ligand in this reaction, replacing water molecules in the coordination sphere of the copper ion, forming…
Correct answer: [Cu (NH3)4 (H2O)2]2+- A. [Co(en)2Cl2]
- B. [Co(en)2Cl2]2-
- C. [Co(ebn)2Cl2]1-
- D. [Co(en)2Cl2]1+
Explanation: The correct formula for Dichloro-Bis-ethylenediamine cobalt (II) is [Co(en)2Cl2].
Correct answer: [Co(en)2Cl2]- A. Blue
- B. Greenish blue
- C. Bluish green
- D. Colourless
Explanation: Transition elements exhibit color due to d-d transition. d-d transition is possible only when the d subshell has unpaired electrons.
Correct answer: Colourless- A. Cr
- B. Mn
- C. Zn
- D. Fe
Explanation: Zinc (Zn) is considered a non-typical transition element because it does not exhibit typical transition metal properties like variable…
Correct answer: Zn- A. 3d
- B. 4d
- C. 5d
- D. 6d
Explanation: In the fourth transition series, the subshell that is in the process of completion is the 3d subshell.
Correct answer: 3d- A. Fe
- B. Co
- C. Sb
- D. Ni
Explanation: Antimony (Sb) is not ferromagnetic. It is considered a diamagnetic material, which means it is weakly repelled by both poles of a magnet…
Correct answer: Sb