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 6 of 8
- A. 1s2, 2s2, 3s2, 2p6, 3p6, 4s2, 3d6
- B. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4
- C. 1s1, 2s2, 2p6, 3s2, 3p6, 3d6
- D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
Explanation: The atomic number of chromium = 24. Cr (Z = 24) = 1s2, 2s2 2p6 3s2 3p6 4s1 3d5
Correct answer: 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5- A. Monodentate
- B. Bidentate
- C. Tridentate
- D. Polydentate
- E. None of the above
Explanation: EDTA ion is polydentate. Ethylenediaminetetraacetic acid (EDTA) is an amino polycarboxylic acid with the formula [CH2N(CH2CO2H)2]2.
Correct answer: Polydentate- A. Mg2+
- B. Ti3+
- C. V3+
- D. Fe2+
Explanation: The correct answer is Fe2+. The electron configuration for Fe2+ is [Ar] 3d6, with the 3d subshell holding six electrons: four of these are…
Correct answer: Fe2+- A. Transition elements containing small proportion of H, B, C, N
- B. Transition elements containing small proportion of He, Ne, Ar, Xe
- C. The compounds in which transition elements are in their highest oxidation state.
- D. The compounds of transition elements which are not stable.
Explanation: An interstitial compound, or interstitial alloy, is a compound that is formed when an atom with a small enough radius sits in an…
Correct answer: Transition elements containing small proportion of H, B, C, N- A. Zn
- B. Cd
- C. Cu
- D. Hg
Explanation: A typical transition element cation must have a partially filled 3d subshell. This is true for Cu as Cu2+ has 3d9 configuration.
Correct answer: Cu- A. Always decreases across a period
- B. Increases till Mn and then decreases till Zn
- C. Always increases across a period
- D. Decreases till Mn and increases till Zn
Explanation: The trend of unpaired electrons in transition metals across a period is sporadic and not constant, it increases till Mn and then decreases…
Correct answer: Increases till Mn and then decreases till Zn- A. 9
- B. 3
- C. 6
- D. 5
Explanation: Coordination number, also known as ligancy, is the number of atoms, ions, or molecules that a central atom or ion carries in a complex or…
Correct answer: 6- A. [Ar] 3d44s1
- B. [Ar] 3d44s2
- C. [Ar] 3d54s2
- D. [Ar] 3d54s1
Explanation: In 3d series (1st series of transition elements), two elements "Cr" and "Cu" have differe electronic configuration.
Correct answer: [Ar] 3d54s1- A. [Ar]4s23d4
- B. [Ar) 4s23d4
- C. [Ar]3d54s1
- D. [Ar)4s13d6
Explanation: The correct electronic configuration of Chromium (Cr) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵.
Correct answer: [Ar]3d54s1- A. Pt
- B. Fe
- C. Cu
- D. W
Explanation: Tungsten (W) is used in bulbs because of its physical properties like high melting point compared to other options and apt resistivity to…
Correct answer: W- A. Lead
- B. Copper
- C. Silver
- D. Gold
- E. None of the above
Explanation: The explanation for this question will be added soon.
Correct answer: Lead- A. Mn
- B. Fe
- C. Zn
- D. Cr
Explanation: The electronic configuration of zinc is [Ar]3d10 4s2 It can only lose two electrons from the 4s orbital and show +2 oxidation state.
Correct answer: Zn- A. Cu
- B. Sc
- C. Zn
- D. Cr
Explanation: Zn has its d orbital completely filled thus it cannot be called a transition element and cannot possess the properties shown by the…
Correct answer: Zn- A. Na
- B. Cr
- C. Rb
- D. K
Explanation: Chromium (Cr) is a transition metal, therefore it forms complexes due to the difference in the electronic configuration.
Correct answer: Cr- A. 48
- B. 32
- C. 58
- D. 28
- E. 38
Explanation: According to federal text book, there are 38 transition elements. These d-block elements have 4 series i.e first outer transition series…
Correct answer: 38- A. Because of high melting point
- B. Because d-electrons of outer shell take part in bonding
- C. Because s-electrons of the outer shell take part in bonding
- D. Both s and d electrons take part in bonding
Explanation: Metallic bonding is a type of chemical bonding that arises from electrostatic attractive forces between conduction electrons in the form…
Correct answer: Both s and d electrons take part in bonding- A. Diamagnetic
- B. Paramagnetic
- C. Good conductor
- D. Ferromagnetic
Explanation: Paramagnetic substances are attracted to magnetic fields.
Correct answer: Paramagnetic- A. Ligand
- B. Monodentate ligand
- C. Bidentate ligand
- D. Polydentate ligand
Explanation: Bidentate ligands have two electron pairs that they can donate to form a dative bond.
Correct answer: Bidentate ligand- A. Zn
- B. Mg
- C. H
- D. All of these
Explanation: C is correct option because several interstitial compounds are formed by the transition metals.
Correct answer: H- A. Complex compound
- B. Transition element ion
- C. Anion
- D. Complex anion
Explanation: [Fe(CN)6)4- is a complex species as it has a central transition metal ion, Fe2+, that is surrounded by 6 anions, CN-, which act as ligands…
Correct answer: Complex anion