Free Electronic Structure of d-Block Elements MCQs with Answers

• A. 3
• B. 4
• C. 6
• D. 1

Explanation: Option B "4"It is the total number of electron pair donated by ligands to the central metal atom or ion .

• A. Coinage metals
• B. Nobel metals
• C. Transition metals
• D. Alkali metals

Explanation: D-block elements are call transition metals while f block are called inner transition elements.

• A. Sc
• B. Y
• C. Cd
• D. Co

Explanation: Option D is correct since only Co is a typical transition element.Group 2B (Zn, Cd, and Hg) and group 3B(Sc, Y, and La) are nontypical…

• A. Orbitals of f-subshell
• B. Orbital's of d-sub shell
• C. Orbitals of p-subshell
• D. Both A and B

Explanation: This option is correct because it covers both option A and option B which are true.

• A. Ionization state
• B. Oxidation state
• C. Electronic configuration
• D. Formation of complexes

Explanation: Lanthanides and actinides are both transition elements and form complexes.

• A. Na
• B. Co
• C. Ba
• D. Ra

Explanation: "Cobalt" shows variable transition states and has a partially filled d-orbital therefore it is a transition element hence the answer is B.

• A. 48
• B. 32
• C. 58
• D. 28

Explanation: There are "38" d-block elements that show variable oxidation states and have partially filled d-orbitals hence the answer is A.

• A. Diamagnetic
• B. Paramagnetic
• C. Good conductor
• D. Ferromagnetic

Explanation: Compounds which have one or more unpaired electrons are attracted to poles of magnets and such compounds are called paramagnetic…

• A. Cr
• B. Mn
• C. Fe
• D. All of these

Explanation: The presence of unpaired electrons causes a molecule to be paramagnetic.

• A. Molecular
• B. Ionic
• C. Covalent
• D. Metallic

Explanation: Explanation:Electron gas theory was proposed by Drude and Loren. It helps explain the bonding in metals.

• A. Zn, Cd, Pb
• B. Zn, Cd, Hg
• C. Zn, Cd, Ba
• D. Zn, Cd, Bi

Explanation: Explanation:In modern periodic table, the elements in group ll-B are Zn, Cd, and Hg. This option is not correct.

• A. d-orbital
• B. s-orbital
• C. p-orbital
• D. None of the above

Explanation: Explanation:The color of the transition metal ions/compounds is due to the electrons present in d-orbital.

• A. Unpaired electrons
• B. Paired electrons
• C. Protons
• D. Neutrons

Explanation: A is correct as the presence of unpaired electrons results in a weak attraction to magnets.An unpaired electron has a magnetic dipole…

• A. Central metal ion
• B. Water molecule
• C. Complex ion
• D. Outer anion

Explanation: The central metal ion has the coordination number 4. To bring the electrons from lower to higher energy levels, the photon is absorbed and…

• A. Linear
• B. Square planar
• C. Tetrahedral
• D. Octahedral

Explanation: The cobalt ion is in +3 oxidation state and has an electronic configuration of 3d6.

• A. Lanthanides
• B. Transition elements
• C. Rate gases
• D. Actinides

Explanation: Actinides are a series of chemical elements that span from atomic number 89 (actinium) to 103 (lawrencium) on the periodic table.

• A. Scandium family
• B. Iron family
• C. Titanium family
• D. Beryllium family

Explanation: Beryllium (Be) and its family, which includes elements such as magnesium and calcium, are not transition metals.

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: The charge on EN is 0. The charge on the water is 0, the charge on CN is -1, and the charge on the complex is +2.

• A. Zn2
• B. Cu2
• C. Fe
• D. Ba+2

Explanation: Reaction is CuSO4+2NH4OH----> (NH4)2SO4 +Cu(OH)2 The solution contains Cu2+ ions.

• A. red
• B. blue
• C. orange
• D. black

Explanation: Nickel bis(dimethyl glyoximate) is the coordination complex with a bright red colour.