All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 539 of 686
- A. CH3COO−
- B. (CH2)2(NH2)2
- C. SCN−
- D. NO2−
Explanation: A chelating ligand is a ligand that is mostly attached to a central metal ion by bonds that are from two or more donor atoms.
Correct answer: (CH2)2(NH2)2- A. KMnO4
- B. MnO2
- C. MnCl2
- D. Mn2(SO4)3
Explanation: The reducing power is the ability to give electrons and reduce others. The compound having maximum oxidation number will have the zero…
Correct answer: KMnO4- A. Lead
- B. Iron
- C. Copper
- D. Chromium
Explanation: Fe 2+ and Fe3+ ions are used as catalysts in this reaction since both the reactants are negatively charged, they repel each other, leading…
Correct answer: Iron- A. -2
- B. 6
- C. 4
- D. None
Explanation: In [Co(en)2 Cl2] No. of monodentate ligand (Cl) =2 No. of bidentate ligand,(Ethylene diamine) =2 ∴ Co-ordination no. of the metal =2+2×2=6
Correct answer: 6- A. Sc
- B. Mn
- C. V
- D. Ti
Explanation: The acidic strength of oxides of different elements will depend on the tendency of oxygen atoms to accept electrons.
Correct answer: Mn10766. Ethylenediamine diacetate is
- A. Didentate
- B. Tridentate
- C. Tetradentate
- D. Hexadentate
Explanation: Ethylenediamine diacetate is a chemical compound with tetradentate coordination properties, not bidentate.
Correct answer: Tetradentate- 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: 2610778. Which of the following transition metals show a 3d5 configuration in their +2 oxidation state?
- 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