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 6 of 27
- A. 1s2, 2s2, 3s2, 2p6, 3p6, 4s2, 3d6
- B. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4
- C. 1s1, 2s2, 2p6, 3s2, 3p6, 3d6
- D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
Explanation: The atomic number of chromium = 24. Cr (Z = 24) = 1s2, 2s2 2p6 3s2 3p6 4s1 3d5
Correct answer: 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5- A. Monodentate
- B. Bidentate
- C. Tridentate
- D. Polydentate
- E. None of the above
Explanation: EDTA ion is polydentate. Ethylenediaminetetraacetic acid (EDTA) is an amino polycarboxylic acid with the formula [CH2N(CH2CO2H)2]2.
Correct answer: Polydentate- A. Mg2+
- B. Ti3+
- C. V3+
- D. Fe2+
Explanation: The correct answer is Fe2+. The electron configuration for Fe2+ is [Ar] 3d6, with the 3d subshell holding six electrons: four of these are…
Correct answer: Fe2+- A. Transition elements containing small proportion of H, B, C, N
- B. Transition elements containing small proportion of He, Ne, Ar, Xe
- C. The compounds in which transition elements are in their highest oxidation state.
- D. The compounds of transition elements which are not stable.
Explanation: An interstitial compound, or interstitial alloy, is a compound that is formed when an atom with a small enough radius sits in an…
Correct answer: Transition elements containing small proportion of H, B, C, N- A. Zn
- B. Cd
- C. Cu
- D. Hg
Explanation: A typical transition element cation must have a partially filled 3d subshell. This is true for Cu as Cu2+ has 3d9 configuration.
Correct answer: Cu- A. Always decreases across a period
- B. Increases till Mn and then decreases till Zn
- C. Always increases across a period
- D. Decreases till Mn and increases till Zn
Explanation: The trend of unpaired electrons in transition metals across a period is sporadic and not constant, it increases till Mn and then decreases…
Correct answer: Increases till Mn and then decreases till Zn- A. 9
- B. 3
- C. 6
- D. 5
Explanation: Coordination number, also known as ligancy, is the number of atoms, ions, or molecules that a central atom or ion carries in a complex or…
Correct answer: 6- A. 2
- B. 6
- C. 4
- D. 8
Explanation: The coordination number of a transition metal complex is defined as the number of ligands attached to the central metal atom/ion.
Correct answer: 6- A. 0
- B. 2
- C. 4
- D. 6
Explanation: CO is a neutral monodentate ligand. The charge on the overall complex is zero.
Correct answer: 0- A. outer transition elements
- B. inner transition elements
- C. typical transition elements
- D. Transition elements
Explanation: Transition elements are those elements that have partially filled d orbitals in their ground state or common oxidation states.
Correct answer: Transition elements- A. increases
- B. decreases
- C. remain same
- D. no regular trend
Explanation: This is generally correct. As you move across the 3d series from left to right, there is an increase in the atomic number.
Correct answer: increases- A. orbitals of f sub shell
- B. orbitals of d sub shell
- C. both a and b
- D. Orbitals of p-subshell
Explanation: Transition elements are characterized by the partially filled d-subshell in their electronic configuration.
Correct answer: both a and b- A. anion
- B. cation
- C. ligand
- D. acid
Explanation: Ligands are molecules or ions that donate electrons to a central metal atom to form a coordination complex.
Correct answer: ligand- A. Ammine
- B. oxalato
- C. carbonyl
- D. cyano
Explanation: A chelate is a complex in which a central metal ion is bonded to the same ligand at multiple points.The oxalate ion (C₂O₄²⁻) has two…
Correct answer: oxalato- A. Poly-dentate ligand
- B. Chelate
- C. Mono dentate ligand
- D. hydrate
Explanation: Chelate ligands are a type of poly-dentate ligands that can form a ring structure with a metal ion by donating multiple lone pairs of…
Correct answer: Chelate- A. +7
- B. -7
- C. +6
- D. -6
Explanation: To determine the oxidation number of manganese (Mn) in the permanganate ion [MnO4]2-, we can assign oxidation numbers to the other…
Correct answer: +6- A. activation
- B. enameling
- C. corrosion
- D. coating
Explanation: It refers to the gradual degradation of metals through a chemical reaction with the surrounding environment.
Correct answer: corrosion118. When an active metal like Al comes in contact with less reactive element like Cu then it produces
- A. dry cell
- B. electrolytic cell
- C. galvanic cell
- D. both and and b
Explanation: Galvanic cells, also known as voltaic cells, generate electrical energy through spontaneous redox reactions.
Correct answer: galvanic cell- A. Sc
- B. Y
- C. Cd
- D. Co
Explanation: Galvanic cells, also known as voltaic cells, generate electrical energy through spontaneous redox reactions.
Correct answer: Co- A. I2O4 (iodine tetroxide)
- B. I4O2 (iodine dioxide)
- C. I2O5
- D. All are equally useful
Explanation: The correct answer is (c) I2O5 (iodine pentoxide).Why I2O5 is used for CO2 analysis:I2O5 is a powerful oxidizing agent and reacts readily…
Correct answer: I2O5