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 17 of 27
- A. Dil.solution of NaOH
- B. Dil.solution of Pb(NO3)2
- C. Dil.solution of NH3
- D. Dil.solution of FeCl3
Explanation: The white precipitate of silver chloride dissolves in excess of ammonia, hypo solution and NaCN while bromide ions give a cream…
Correct answer: Dil.solution of NH3- A. [Fe(H2 O)6 ]+2
- B. [Cu(NH3 )4 (H2 O)2 ]+2
- C. [Fe (SCN) (H2 O)5 ]+2
- D. [Fe(H2 O)6 ]
Explanation: [Fe (SCN) (H2O)5 ]+2 is used as artificial blood.
Correct answer: [Fe (SCN) (H2 O)5 ]+2- A. Uranium
- B. Samarium
- C. Thorium
- D. Osmium
Explanation: All the elements belong in f-block except Osmium which belongs to the d-block.
Correct answer: Osmium- A. FeSO4 solution
- B. CuSO4 Solution
- C. MgSO4 Solution
- D. H2SO4 solution
Explanation: According to the reactivity series, magnesium is more reactive than iron hence it will displace the iron in iron sulphate and form…
Correct answer: FeSO4 solution- A. Yellow
- B. Black
- C. Blue
- D. Colorless
Explanation: The electronic configuration of Zn2+ is 3d10 4s0. All the electrons are paired. Hence, all Zn2+ compounds are colorless or white.
Correct answer: Colorless- A. Zn
- B. Fe
- C. Cu
- D. Mn
Explanation: Zn, with a filled 3d shell, has an oxidation state of +2 and does not exhibit multiple oxidation states as transition metal atoms do, even…
Correct answer: Zn- A. Polydentate ligands
- B. Monodentate ligand
- C. Bidentate ligands
- D. Hexadentate ligands
Explanation: Bidentate ligands have two lone pairs, both of which can bond to the central metal ion.
Correct answer: Bidentate ligands- A. Presence of unpaired electrons
- B. Transition of electrons from t2g to eg within d orbitals
- C. Holes present in crystal lattice of transition elements
- D. Small, highly charged ions and vacant d-orbitals of suitable energy
Explanation: Transition elements form interstitial compounds bevause they have holes in their crystal lattice in which small atoms like C,N,B and H can…
Correct answer: Holes present in crystal lattice of transition elements- A. III B & IV B
- B. 1 B and 2 B
- C. IV B and III B
- D. VB and VI B
Explanation: In the transition elements (transition metals), the number of unpaired electrons increases up to Group 6B, and then it decreases onwards.
Correct answer: VB and VI B- A. IIIB
- B. IV B
- C. IIB
- D. VB
Explanation: The binding energy of transitional elements weakens progressively up to Group IIB (Group 4) in the transition metals.
Correct answer: IIB- A. 6
- B. 14
- C. 22
- D. 26
Explanation: The number of unpaired electrons in an element's ground state corresponds to the element's atomic number, which is the number of protons…
Correct answer: 26- A. Cu+2
- B. Fe+2
- C. Mn+2
- D. Zn+2
Explanation: Mn²⁺: Manganese in the +2 oxidation state has an electron configuration of [Ar] 3d⁵, which is a half-filled d-subshell, making it stable.
Correct answer: Mn+2- A. 1s2 2s2 2p6 3s2 3p6 3d5 4s¹
- B. 1s2,2s2,2p6,3s2,3p6,4s1,3d4
- C. 1s2,2s2,2p6, 3s2,3p6,3d6
- D. 1s2,2s2,2p6,3s2,3p6,4f6
Explanation: The atomic number of chromium (Cr) is 24. To determine its correct electron configuration, we can use the Aufbau principle, which states…
Correct answer: 1s2 2s2 2p6 3s2 3p6 3d5 4s¹- A. C4H4O
- B. C5H3O
- C. C4H5O
- D. C4H3O
Explanation: Option A is correct. The molecular formula of furan is C4H4O. Furan is a heterocyclic aromatic compound characterized by a five-membered…
Correct answer: C4H4O- A. Fe+2 and Mn+2
- B. Fe+2 and Mn+3
- C. Fe+3 and Mn+3
- D. Fe+3 and Mn+2
Explanation: Here's a breakdown of the electron configurations for each ion:Fe+3: [Ar] 3d5Mn+2: [Ar] 3d5As you can see, both ions have 5 unpaired…
Correct answer: Fe+3 and Mn+2336. Brass is an alloy of
- A. Copper and Iron
- B. Copper and Mg
- C. Copper and Zinc
- D. Copper and Silver
Explanation: Brass is a binary alloy composed of copper (Cu) and zinc (Zn). The proportion of copper and zinc can vary, but it is typically a…
Correct answer: Copper and Zinc- A. Ammine
- B. Hydrazine
- C. Aqua
- D. Carbonyl
Explanation: Hydrazine - Correct. Hydrazine (N₂H₄) has two nitrogen atoms, each capable of donating a lone pair, making it a bidentate ligand.
Correct answer: Hydrazine- A. Atomic size
- B. Orbital configuration
- C. Very light
- D. Hard elements
Explanation: Transition metals have similar atomic sizes, allowing atoms of different metals to mix and form alloys.
Correct answer: Atomic size- A. K2MnO4
- B. K2Cr2O7
- C. KMnO4
- D. Kl
- E. K2CrO4
Explanation: Heating a mixture of chromite (FeCr2O4) and K2CO3 (not KCO3 as mentioned in the question) in air is done to manufacture option (e)…
Correct answer: K2CrO4- A. Cu and Zn
- B. Cr and Fe
- C. Cr and Cu
- D. Mn and Co
Explanation: The correct answer is Cr and Cu. Chromium (Cr) has an electron configuration of [Ar] 3d5 4s1, which results in five unpaired electrons in…
Correct answer: Cr and Cu