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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Read the Transition Elements notesFree MDCAT chapter notes with key terms531 questions · page 21 of 27
- A. Simple ions only
- B. Complex ions only
- C. Complex ions and simple ions
- D. Weak acid HCN
Explanation: When K4[Fe(CN)6] is dissolved in a salt solution, it dissociates into simple ions and complex ions.
Correct answer: Complex ions and simple ions- A. Covalent bonds
- B. Co-ordinate covalent bond
- C. lonic bonds
- D. All of these
Explanation: In coordination compounds, ligands are Lewis bases and central metal atom are Lewis acid so these form coordinate covalent bond.
Correct answer: Co-ordinate covalent bond- A. [Cu(H2O)6]2+
- B. [Pt(C2O4)2]2-
- C. [CuCl]2-
- D. All have the same stability
Explanation: The stability of a coordination complex often depends on the nature of the ligands.
Correct answer: [Pt(C2O4)2]2-- A. Anionic in nature always
- B. Neutral in nature always
- C. Cationic in nature always
- D. All are possible
Explanation: A. Anionic coordination sphere Ka[Fe(CN)6]B. Neutral coordination sphere [Fe(CO)s]C. Cationic coordination sphere [Cu(NH3)4]SO4
Correct answer: All are possible- A. Orbitals of s-subshell
- B. Orbitals of d-subshell
- C. Orbitals of p-subshell
- D. Both A and B
Explanation: When d-orbitals are involved in bonding, they split into two energy levels (lower and higher).
Correct answer: Orbitals of d-subshell- A. Fe
- B. Cr
- C. Zn
- D. Cu
Explanation: Amongst the given options only Zn shows one stable oxidation state that is +2.
Correct answer: Zn- A. Linear
- B. Trigonal bipyramid
- C. Square planar
- D. Octahedral
Explanation: Many transition metal complexes adopt octahedral geometries, with six donor atoms forming bond angles of 90° about the central atom with…
Correct answer: Octahedral- A. Mn
- B. Cr
- C. Fe
- D. Ni
Explanation: Electronic configuration of Cr= Cr = (Ar) 3d5 4s1. According to the electronic configuration, the number of unpaired electrons is 6.
Correct answer: Cr- A. 2
- B. 4
- C. 3
- D. 5
Explanation: Copper Sulfate Pentahydrate Structure: In CuSO₄·5H₂O, the copper ion (Cu²⁺) is surrounded by five water molecules.Coordinate Covalent…
Correct answer: 4- A. Yellow
- B. Green
- C. Blue
- D. Red
Explanation: As per the reference, yellow light is absorbed by [Ti(H2O)6]3+. Thus, option A is correct.
Correct answer: Yellow- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Cobalt is not used as a catalyst for catalytic oxidation of methane. Thus option C is correct, as the catalyst is mismatched with the…
Correct answer: Option C- A. Cr
- B. Cu
- C. Zn
- D. Fe
Explanation: Highest oxidation state of Cr is +6. Thus, among the given options Cr is the correct answer.
Correct answer: Cr- A. Zn+2
- B. Sc+3
- C. Mn+2
- D. Cr+3
Explanation: C) Mn2+: The manganese ion (Mn2+) has five unpaired electrons in the 3d sub-shell.
Correct answer: Mn+2- A. Oxidation number
- B. Coordination number
- C. Effective atomic number
- D. Coordination complex
Explanation: The number of lone pair of electrons provided by the ligands to the central metal atom or ion is called the coordination number of the…
Correct answer: Coordination number- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: a) Titanium (Ti): Titanium commonly exhibits oxidation states of +2 and +4.
Correct answer: Option C- A. Alkali metals
- B. Transition elements
- C. Alkaline earth metal
- D. Element which form border line compound
Explanation: Correct option: Based on the information provided, the correct option for elements used as catalysts in chemical reactions is: B)…
Correct answer: Transition elements- A. +1, +2
- B. +2, +3
- C. +4, +5
- D. +6, +7
Explanation: Based on the typical behavior of elements in the 3d-series of the periodic table, the correct option for stable oxidation states is…
Correct answer: +2, +3- A. [Co(NH3 )4 (H2 O)Br](NO3 )2 .
- B. [Co(NH3 ) (H2 O)Br](NO3 )2 .
- C. Co[Br(H2O)(NH3)4](NO3)2
- D. Co[(NO)(NH3)4(H2O)Br](NO3)2
Explanation: Central metal ion: The central metal is cobalt (Co), and its oxidation state is +3(indicated by "III").Ligands:NH3 (ammine) is a neutral…
Correct answer: [Co(NH3 )4 (H2 O)Br](NO3 )2 .419. Scandium has atomic number 21. Which one of the following will be its electronic configuration?
- A. 1s2 2s2 2p6, 3s2 3p6 3d3
- B. 1s2 2s2 2p6 3s2 3p6 4s2 4p1
- C. 1s2 2s2 2p6 3s2 3p6 3d1 4s2
- D. 1s22s22p63s23p64s64p2
Explanation: The correct electronic configuration for scandium (atomic number 21) is Option C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^1 4s^2.
Correct answer: 1s2 2s2 2p6 3s2 3p6 3d1 4s2- A. They are all metals in true sense
- B. They show variable oxidation state
- C. They have high melting and boiling points
- D. Their ionization energy is less than that of IIA group elements
Explanation: The ionization energy of an atom is the energy required to remove an electron from the atom.
Correct answer: Their ionization energy is less than that of IIA group elements