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.
Last updated
Read the Transition Elements notesFree MDCAT chapter notes with key terms531 questions · page 9 of 27
- A. [Cr(NH3)5SO4]Cl
- B. [Co(NH3)4SO4]NO2
- C. [Cr(NH3)5Cl]SO4
- D. Both (A) and (C)
Explanation: A white precipitate with BaCl2 indicates the presence of free sulfate ions (SO42-) in the solution, which form insoluble BaSO4.
Correct answer: [Cr(NH3)5Cl]SO4- A. Potassium Alumino oxalate
- B. Potassium trioxalatoaluminate(III)
- C. Potassium aluminium(III) oxalate
- D. Potassium trioxalato aluminate(VI)
Explanation: Following IUPAC nomenclature rules for coordination compounds: the cation (Potassium) is named first.
Correct answer: Potassium trioxalatoaluminate(III)- A. Tetraammine dihydroxo-platinum (IV) sulphate
- B. Dihydroxo tetraammine-platinum (V) sulphate
- C. Tetra-ammine dihydroxo-platinum (II) sulphate
- D. Dihydroxo tetraammine-platinum (IV) sulphate
Explanation: As per the nomenclature of complex compounds, the correct name of given compound is "Tetraammine dihydroxo-platinum (IV) sulphate".
Correct answer: Tetraammine dihydroxo-platinum (IV) sulphate- A. All the elements except Scandium show +2 oxidation state
- B. They show variable oxidation because of the involvement of the unpaired d-electrons in addition to s-electrons
- C. Fe+3 ion is more stable than Fe+2 ion
- D. First four elements in the highest oxidation state use all of the s and d electrons for bonding
Explanation: Many transition metals (except Sc) can show the +2 oxidation state, but not all do consistently.
Correct answer: All the elements except Scandium show +2 oxidation state- A. 4
- B. 5
- C. 6
- D. 8
Explanation: The coordination number is the number of donor atoms directly bonded to the central metal ion. In this complex.
Correct answer: 6- A. Square planar
- B. Trigonal bipyramidal
- C. Triangular
- D. Octahedral
Explanation: According to VSEPR theory and experimental evidence, the geometry that minimizes repulsion for a centralatom bonded to five other groups…
Correct answer: Trigonal bipyramidal- A. +2, +3, 0
- B. +3, 0, +3
- C. +2, +3, +4
- D. 0, +3, +4
Explanation: For [Fe(CN)6]4-: Fe +6[-1]=-4. so Fe=+2. For [Co(NH3)3 (NO₂)3]: Co + 3(0) +3(-1)=0 so Co =+3. For [Ni(CO)4] Ni+4(0)=0 so Ni =0.
Correct answer: +2, +3, 0- A. Pyramidal
- B. Square planar
- C. Octahedral
- D. Bipyramidal
Explanation: There are five carbonyl (CO) ligands attached with central atom (Fe), so coordination no is 5.
Correct answer: Bipyramidal- A. [Cu(H₂O6)]+2
- B. [Pt(C₂O4)2]-2
- C. [CuCl]-2
- D. All have the same stability
Explanation: Complexes with polydentate ligands are more stable because they form chelate rings.
Correct answer: [Pt(C₂O4)2]-2- A. Estimating the concentration of iron
- B. Measuring the concentration of CN-
- C. Measuring the solid state magnetic moment.
- D. Thermally decomposing the compound.
Explanation: The different electronic arrangements (Fe(II) vs Fe(III)) would result in a different number of unpaired d-electrons on the ron center.
Correct answer: Measuring the solid state magnetic moment.- A. Yellow, Green
- B. Red, Yellow
- C. Blue, Green
- D. Red, Blue
Explanation: In [Ti(H₂O6)]+3, yellow light is absorbed while most of the red and blue lights are transmitted, therefore the solution of [Ti(H206)]+3…
Correct answer: Red, Blue- A. 1
- B. 5
- C. 4
- D. Unpredictable
Explanation: In hexafluoroferrate(III), the iron is in the +3 oxidation state, giving it a d5 electron configuration.
Correct answer: 5- A. I- < H2O < NH3 < CN-
- B. CN- < I- < H2O < NH3
- C. CN- < NH3 < H2O < I-
- D. NH3 < H2O < I- < CN-
Explanation: This question asks for the order of ligand strength according to the spectrochemical series arranges ligands based on their ability to…
Correct answer: I- < H2O < NH3 < CN-- A. 4
- B. 2
- C. 6
- D. -4
Explanation: The coordination number refers to the number of atoms or ions bonded directly to the central atom in a complex ion or molecule.
Correct answer: 6- A. Zero
- B. Two
- C. Four
- D. Six
Explanation: In [Co(NH3)6]+3, the coordination number of cobalt is six.
Correct answer: Six- A. Square planar
- B. Tetrahedral
- C. Octahedral
- D. Linear
Explanation: Cu(NH3)4]4+ has a square planar structure.
Correct answer: Square planar- A. K4CrO4
- B. K2Cr2O4
- C. Cr2O6
- D. CrCl3
Explanation: Chromium is in the +3 oxidation state. Each oxygen atom contributes -2, and there are two oxygen atoms per chromium atom, so in total, the…
Correct answer: K2Cr2O4- A. Oxidizing agent
- B. Reducing agent
- C. An Acid
- D. A base
Explanation: Potassium dichromate is commonly used as an oxidizing agent in acidic medium.
Correct answer: Oxidizing agent- A. Fe
- B. Ni
- C. Co
- D. All
Explanation: All of the elements mentioned (Fe, Ni, and Co) can form interstitial compounds under suitable conditions.
Correct answer: All- A. Aluminium
- B. Copper
- C. Carbon
- D. Nickel
Explanation: Carbon is an essential element in steel production and is always present.
Correct answer: Carbon