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 3 of 8
- A. tetrahedral
- B. square planar
- C. trigonal bipyramidal
- D. octahedral
Explanation: sp3d2 hybridisation provides six equivalent hybrid orbitals, so six ligand positions are arranged around the central atom in an octahedral…
Correct answer: octahedral- A. English
- B. Greek
- C. Roman numeral
- D. Hebrew
Explanation: The oxidation state of the central metal in a coordination compound is conventionally shown using Roman numerals, usually in parentheses…
Correct answer: Roman numeral- A. complex ion
- B. coordination sphere
- C. ligand
- D. complex compound
Explanation: The central metal atom or ion together with the ligands directly attached to it forms the coordination sphere, written inside square…
Correct answer: coordination sphere44. The species which donate two electron pairs in a coordination compound is called__________________?
- A. ligand
- B. mono-dentate ligand
- C. poly-dentate ligand
- D. bi-dentate ligand
Explanation: A ligand that donates two electron pairs through two donor atoms is called a bidentate ligand, such as oxalate or ethylenediamine.
Correct answer: bi-dentate ligand- A. simples ions
- B. complex ions
- C. double salts
- D. strong anions
Explanation: A coordination compound retains its metal-ligand bonding in solution, so it produces complex ions such as [Cu(NH3)4]2+ rather than…
Correct answer: complex ions- A. diamagnetic
- B. paramagnetic
- C. good conductor
- D. ferromagnetic
Explanation: Paramagnetic substances contain one or more unpaired electrons, whose magnetic moments cause attraction toward an applied magnetic field.
Correct answer: paramagnetic- A. Potassium tetra cyano cupperate
- B. Co-ordination number is 2
- C. Ligand is positively charged
- D. Central atom is present in avionic sphere
Explanation: Interpreting the formula as K2[Cu(CN)4], the bracketed complex has a 2− charge and is therefore an anionic coordination sphere containing…
Correct answer: Central atom is present in avionic sphere- A. 0.12 - 0.25%
- B. 2.5 - 4.5%
- C. 2.0 - 4.0%
- D. 0.25 - 2.5%
Explanation: Pig iron contains a relatively high amount of carbon, commonly about 2.5% to 4.5% by mass, along with other impurities.
Correct answer: 2.5 - 4.5%- A. type of ligands
- B. types of hybridization in the elements of ligands
- C. hybridization of central metal
- D. All of above
Explanation: In the valence-bond description of coordination compounds, the geometry is predicted from the hybridisation of the central metal orbitals…
Correct answer: hybridization of central metal- A. polydentate ligand
- B. chelate
- C. monodentate ligand
- D. hydrate
Explanation: A chelate is a coordination species in which a multidentate ligand attaches to the same metal through two or more donor atoms and forms…
Correct answer: chelate- A. ammine
- B. oxalato
- C. carbonyl
- D. cyano
Explanation: Oxalato, C2O4 2−, has two oxygen donor atoms that can bind to the same metal ion and form a chelate ring.
Correct answer: oxalato- A. hydrates
- B. hydrides
- C. binary compounds
- D. interstitial compounds
Explanation: Non-stoichiometric compounds have compositions that do not follow simple whole-number ratios because small atoms such as hydrogen, carbon…
Correct answer: interstitial compounds- A. variable
- B. constant
- C. single
- D. infinite
Explanation: Transition elements usually show variable oxidation states because the energies of their ns and (n-1)d electrons are close, so different…
Correct answer: variable- A. [Ar]4s23d4
- B. [Ar] 4s23d4
- C. [Ar]4s03d5
- D. [Ar]4s13d5
Explanation: Chromium has the configuration [Ar]4s1 3d5 rather than [Ar]4s2 3d4 because a half-filled 3d5 subshell has extra stability.
Correct answer: [Ar]4s13d5- A. increases
- B. decreases
- C. remain same
- D. no regular trend
Explanation: The melting and boiling points of the 3d transition elements generally increase towards the middle of the series because more unpaired d…
Correct answer: increases- A. outer transition elements
- B. inner transition elements
- C. typical transition elements
- D. transition elements
Explanation: Transition elements are elements in which a d or f subshell is being progressively filled in the atom or in a common oxidation state.
Correct answer: transition elements- A. Zn Cd Hg
- B. Fe Ru Os
- C. Cr Mo W
- D. Mn Te Re
Explanation: Group VIB in the older notation corresponds to group 6, whose transition elements are chromium, molybdenum and tungsten, written as Cr, Mo…
Correct answer: Cr Mo W- A. 2
- B. 6
- C. 4
- D. 8
Explanation: The coordination number is the number of donor atoms directly bonded to platinum.
Correct answer: 6- A. 2
- B. 3
- C. 4
- D. 6
Explanation: Coordination number counts the donor atoms directly bonded to the central metal ion.
Correct answer: 6- A. Analytical balance
- B. Guoys balance
- C. Electrical balance
- D. Single beam balance
Explanation: A Gouy balance measures the attraction or repulsion of a sample in a magnetic field, allowing its paramagnetic behaviour and magnetic…
Correct answer: Guoys balance