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. Geometrical isomers.
- B. Linkage isomers
- C. Ligand isomers.
- D. Ionisation isomers.
Explanation: The ligand NO2 has two types of linkage with the central atom. In NO2, N donates an electron pair, while in O NO the O atom donates the…
Correct answer: Linkage isomers- A. [Pt(NH3)Cl3]Br2 and [Pt(NH3)4Br2]Cl2
- B. [Co(NH3)5NO3]SO4 and [Co(NH3)5SO4]NO3
- C. [Cr(H2O)5SCN]2+ and [Cr(H2O)5NCS]2+
- D. [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl2]Cl2.H2O
Explanation: [Cr(H2O)5SCN]2+ and [Cr(H2O)5NCS]2+ exhibits linkage isomerism.
Correct answer: [Cr(H2O)5SCN]2+ and [Cr(H2O)5NCS]2+- A. 1
- B. 2
- C. 4
- D. 5
Explanation: Hexafluoroferrate (III) is [FeF6]3-. The O.N. of Fe in it is x + (-6) = - 3 or x - 6 = -3 or x = + 3.Thus in it, Fe is present as Fe3+…
Correct answer: 5- A. 1
- B. 2
- C. 5
- D. 3
Explanation: The configuration of Mn is [Ar]d5. Thus it is expected to have 5 unpaired electrons.
Correct answer: 1- A. CrCl3.6H2O
- B. [Cr(H2O)3Cl3].(H2O)3
- C. [CrCl2(H2O)4]Cl.2H2O
- D. [CrCl(H2O)5]Cl2.H2O
Explanation: [CrCl2(H2O)4]Cl.2H2O has only one ionisable Cl out of three Cl atoms present in the compound.
Correct answer: [CrCl2(H2O)4]Cl.2H2O- A. 0
- B. +1
- C. +2
- D. +1.5
Explanation: Ag in Tollens reagent exists as Ag2O2 × a + 1 × (-2) = 0a = + 1.
Correct answer: +1- A. d3, d5, d6, d9
- B. d4, d5, d6, d7
- C. d2, d5, d7, d9
- D. d4, d6, d7, d10
Explanation: Metal ions with d4, d5, d6 and d7 configuration can form high spin and low spin complexes.
Correct answer: d4, d5, d6, d7- A. [Ar](n-1)d1-10ns1-2
- B. [Ar](n-1)d1-10ns2
- C. [Ar](n-1)d1-2ns1-2
- D. [Ar](n-2)d1-2ns1-2
Explanation: d-block (outer) transition elements are those in which d-subshell of penultimate shell (inner to valence shell) is in process of…
Correct answer: [Ar](n-1)d1-10ns1-2- A. [Ar] 3d34s2
- B. [Ar] 3d44s2
- C. [Ar] 3d4s2
- D. [Ar] 3d54s2
Explanation: Electronic configuration of Mn is 25Mn 18[Ar] 4s23d5.
Correct answer: [Ar] 3d54s2- A. Sc
- B. Mn
- C. Ti
- D. Zn
Explanation: (A) 21Sc 18[Ar] 4s2 3d1Sc+3 18[Ar] 4sº 3dº (B) 21Ti 18[Ar] 4s2 3d2Ti+3 18[Ar] 4sº 3d1 (C) 25Mn 18[Ar] 4s2 3d5Mn+2 18[Ar] 4sº 3d5 (D) 30Zn…
Correct answer: Zn- A. V
- B. Ti
- C. Sc
- D. Cr
Explanation: 21Sc =18[Ar] 4s2 3d121Sc+3 = 18[Ar] 4s° 3d°Scandium in +3 state has same electronic configuration as 18Ar.Ar = 1s22s22p63s23p6
Correct answer: Sc- A. 0
- B. +2
- C. +1
- D. +3
Explanation: Cu+118[Ar] 4s° 3d10Zn+2 18[Ar] 4s° 3d10 As per the electronic configuration, Cu in +1 oxidation state, achieves electronic configuration…
Correct answer: +1- A. Its d-subshell is incomplete.
- B. Its d-subshell is complete
- C. It is relatively soft metal
- D. It has two electrons in outermost shell
Explanation: 30Zn 18[Ar] 4s2 3d10 Zn+2 18[Ar] 4s° 3d10 Zinc (Zn) has a completely filled d-subshell (3d10) in its electronic configuration.
Correct answer: Its d-subshell is complete- A. +7
- B. -7
- C. +6
- D. +4
Explanation: Mn belongs to group (VIIB)of periodic table. So, its maximum oxidation state should be +7.
Correct answer: +7- A. K4 [Fe(CN)6]
- B. [Co(NO2)3(NH3)3]
- C. [Cu(NH3)4]SO4
- D. .[MnCl4]-2
Explanation: In C option central metal atom and coordination sphere has same charge [Cu+2(NH3)04]+2SO4-2 Here the coordination sphere has a +2 sign and…
Correct answer: [Cu(NH3)4]SO4- A. Zn
- B. Cu
- C. Hg
- D. As
Explanation: "Cu" is used as catalyst in oxidation of lower alkanes.CH4+[O] Cu/400oC→200 atom CH3 -OH.
Correct answer: Cu- A. Cu
- B. Co
- C. Zn
- D. Fe
Explanation: Finely divided "Fe" is used as a catalyst in Haber process. Cr2O3+ MgO + SiO2 is used as promoter.N2 +3H2 Fe/MgO/Cf2O3/SiO,⇌450°C/200 atom…
Correct answer: Fe- A. Sulphuric acid
- B. Plastics
- C. Ethanol
- D. Tetraethyl lead
Explanation: TiCl4 is a key component in the Ziegler-Natta catalyst system, which is essential for the polymerization of ethylene into polyethylene, a…
Correct answer: Plastics- A. Coordination number
- B. Coordination sphere
- C. Oxidation number
- D. Charge on coordination sphere
Explanation: [Fe(CN)6]-4 The algebraic sum of charges on central metal ion and ligand is -4. It is the charge on the coordination sphere.
Correct answer: Charge on coordination sphere- A. Cation, Coordination Sphere, Anion
- B. Coordination Sphere, Cation, Anion
- C. Cation, Anion, Coordination Sphere
- D. Anion, Coordination Sphere, Cation
Explanation: It is a basic rule of nomenclature of complex compounds that cations are named before anions.
Correct answer: Cation, Coordination Sphere, Anion