Free Transition Elements MCQs with Answers
531 Transition 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.
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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- A. d-d transition
- B. d-p transition
- C. p-p transition
- D. s-d transition
Explanation: Transition elements are characterized by having partially filled d-orbitals in their atoms or ions.Color in transition metal compounds…
Correct answer: d-d transition- A. Crystalline structure
- B. Characteristic color
- C. Hardness
- D. Higher reactivity
Explanation: As we discussed earlier, the color of transition metal compounds is directly related to d-d transitions.When light interacts with a…
Correct answer: Characteristic color- A. Ionic
- B. Covalent
- C. Both a and b
- D. None of these
Explanation: Ionic compounds: Transition metals often form ionic compounds where the metal ion is surrounded by ligands (non-metal ions or molecules).
Correct answer: Both a and b- A. Titanium
- B. Chromium
- C. Manganese
- D. Vanadium
Explanation: Boiling point is generally related to the strength of metallic bonding.
Correct answer: Manganese- A. V
- B. Nb
- C. Ta
- D. La
Explanation: Lanthanum (La) is a lanthanide element, not a transition metal. It belongs to the 3rd transition series and has its d-orbitals completely…
Correct answer: La- A. Blue crystalline solid
- B. Not soluble in water
- C. Strong oxidizing agent
- D. Used in formation of lead chromate
Explanation: Potassium dichromate (K₂Cr₂O₇) is a bright orange crystalline solid, not blue.It is a strong oxidizing agent, meaning it readily accepts…
Correct answer: Blue crystalline solid- A. Ceramic acid
- B. Chromic Acid
- C. Dichromate
- D. None of these
Explanation: When potassium dichromate (K₂Cr₂O₇) is acidified, it forms chromic acid (H₂CrO₄).
Correct answer: Chromic Acid- A. They can make colored complexes
- B. They can be used as a catalyst
- C. They have only one valency
- D. They are d block elements
Explanation: Transition metals are known for their variable valencies. This means they can form ions with different charges due to the involvement of…
Correct answer: They have only one valency- A. 2
- B. 3
- C. 5
- D. 4
Explanation: Ferrous ion (Fe²⁺) has the electronic configuration [Ar] 3d⁶.To determine the number of unpaired electrons, we need to fill the d-orbitals…
Correct answer: 4- A. Zn
- B. Fe
- C. Co
- D. Mn
Explanation: As we discussed earlier, magnetic properties are related to the presence of unpaired electrons.Zinc (Zn) has a completely filled…
Correct answer: Zn- A. Cu⁺
- B. Cu²⁺
Explanation: The cupric ion (Cu²⁺) is more stable than the cuprous ion (Cu⁺). This is because the Cu²⁺ ion has a completely filled d¹⁰ configuration…
Correct answer: Cu²⁺- A. [MnCl₄]²⁻
- B. PCl₅
- C. [Cu(NH₃)₄]²⁺
- D. [Co(NH₃)₆]³⁺
Explanation: Square planar geometry is most commonly observed in complexes with a d⁸ electronic configuration.[Cu(NH₃)₄]²⁺ has a copper(II) ion (Cu²⁺)…
Correct answer: [Cu(NH₃)₄]²⁺- A. f block
- B. s block
- C. d block
- D. p block
Explanation: Lanthanide Contraction is a phenomenon observed in the lanthanide series (f-block elements).
Correct answer: f block- A. [MnCl4]-2
- B. [Cu(NH3)4]+2
- C. [Fe(CN)6]-4
- D. [PtF6]-2
Explanation: Because it exists as square planar and has 4 ligands attached to the central atom.
Correct answer: [Cu(NH3)4]+2- A. Sulphuric acid
- B. Plastics
- C. Ethanol
- D. Tetraethyl lead
Explanation: TiCI4 is used as a catalyst in the Ziegler-Natta process, which helps convert ethylene into polyethylene.
Correct answer: Plastics- A. sp3
- B. dsp2
- C. dsp3
- D. d2sp3
Explanation: In this case, option D (d2sp3hybridization) is the correct answer as it shows octahedral geometry.
Correct answer: d2sp3- A. OH
- B. CN
- C. CO
- D. N2H4
Explanation: N2H4 is not a monodentate ligand, it is a bidentate ligand.
Correct answer: N2H4- A. dsp2 , square planar
- B. sp3 , tetrahedral
- C. sp3d, trigonal bipyramidal
- D. d2sp3, octahedral
Explanation: In Wilkinson's catalyst, [RhCI(PPh3)3], the central rhodium (Rh) atom is in a +1 oxidation state with a d electron configuration.
Correct answer: dsp2 , square planar- A. [MnO4]-
- B. [Co(NH3)6]3+
- C. [Fe(CN)6]3-
- D. [Cr(H2O)6]3+
Explanation: To have no d-electrons, the central metal must have a d configuration. In the permanganate ion [MnO4]- the oxidation state of Manganese…
Correct answer: [MnO4]-- A. [Co(NH3)4NO2Cl] [(NH3)Cl]
- B. [Co(NH3)5Cl] [Cl(NO2)]
- C. [Co(NH3)5(NO2)] Cl2
- D. [Co(NH3)5] [(NO2)Cl2]
Explanation: Precipitating two moles of AgCl indicates that there are two chloride ions in the outer ionization sphere.
Correct answer: [Co(NH3)5(NO2)] Cl2