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 541 of 686
- A. Always diamagnetic
- B. Attracted by the magnet
- C. Not attracted by the magnet
- D. Repelled by the magnet
Explanation: This is correct. Unpaired electrons give rise to paramagnetism, causing the substance to be attracted by a magnet.
Correct answer: Attracted by the magnet- A. Water
- B. Sodium chloride
- C. Potassium sulfate
- D. Potassium dichromate
Explanation: Correct. The equilibrium between chromate and dichromate ions is pH-dependent.
Correct answer: Potassium dichromate- A. Paramagnetic
- B. Diamagnetic
- C. Polymagnetic
- D. Ferrimagnetic
Explanation: Correct. Paramagnetic substances have unpaired electrons and are attracted to a magnetic field.
Correct answer: Paramagnetic- A. Sc
- B. Y
- C. La
- D. Ac
Explanation: Sc) - Correct: The first transition series begins with Scandium (Z = 21).
Correct answer: Sc- A. 10
- B. 14
- C. 40
- D. 58
Explanation: 40) - Correct: The total number of transition elements is 40 (10 in each of the 4 transition series)
Correct answer: 40- A. The trans form is achiral and optically inactive while the cis form is chiral and exists in two enantiomeric forms.
- B. Both the cis and trans forms are achiral and optically inactive.
- C. The trans form is chiral and exists in two enantiomeric forms while the cis form is achiral and optically inactive.
- D. Both the cis and trans forms are chiral, and each exists in two enantiomeric forms.
Explanation: Cis is optically active and trans is optically inactive. For this question, you have to understand the fact that in the trans condition…
Correct answer: The trans form is achiral and optically inactive while the cis form is chiral and exists in two enantiomeric forms.- A. Trigonal planar, trigonal pyramidal and three.
- B. tetrahedral, pyramidal and two.
- C. trigonal planar, tetrahedral and three.
- D. linear, pyramidal and three.
Explanation: The geometry around S are trigonal planar, the geometry around N are trigonal pyramidal and the number of resonating structure will be…
Correct answer: Trigonal planar, trigonal pyramidal and three.- A. PtCl4.6NH3
- B. PtCl4.5NH3
- C. PtCl4.4NH3
- D. Equal.
Explanation: Platinium has a coordination number equal to six. The structures of the complexes are,PtCl4.6NH3 ,PtCl4.5NH3 and , PtCl4.4NH3 which…
Correct answer: PtCl4.6NH3- A. 10 and 3.
- B. 1 and 6
- C. 6 and 2.
- D. 6 and 4.
Explanation: [X(SO4)(NH3)5] contains X in +2 oxidation state and the coordination number is 6.
Correct answer: 6 and 2.- A. 3
- B. 6
- C. 5
- D. 4
Explanation: [Cu(NH3)4] [PtCl4] shows [Cu(NH3)3Cl] [PtCl3(NH3)], [Pt(NH3)3Cl] [Cu(NH3)Cl3], [Pt(NH3)4] [CuCl4] [Cu(NH3)4] [PtCl4].
Correct answer: 4- A. [Pt(NH3)2Cl2].
- B. [Pt(NH3)Cl4].
- C. [Pt(en)3]4+
- D. [Pt(en)2Cl2]
Explanation: Structure: Octahedral (d⁶, Pt(IV)).Geometrical Isomerism: Yes, cis- and trans-isomers exist due to the arrangement of Cl ligands relative…
Correct answer: [Pt(en)2Cl2]- A. C4H9Li.
- B. (C2H5)4Pb.
- C. [(C5H5)2Fe].
- D. C2H5-O-Na
Explanation: Compounds in which the carbon or organic groups are directly bonded to metal atoms are known as organometallic compounds.
Correct answer: C2H5-O-Na- A. [Co(NH3)6] [Cr(CN)6] and [Co(CN6)] [Cr(NH3)6].
- B. [Cr(H2O)5Cl]Cl2.H2O and [Cr(H2O)4Cl2]Cl.2H2O.
- C. [Co(NH3)5Br] SO3 and [Cr(NH3)5SO4]Br.
- D. [Pt(NH3)2Cl2] and [Pt(NH3)4] [PtCl4].
Explanation: When both positive and negative ions are complex, coordination isomerism may occur due to the interchange of ligands within the…
Correct answer: [Co(NH3)6] [Cr(CN)6] and [Co(CN6)] [Cr(NH3)6].- A. Co(NH3)4Cl3
- B. Co(NH3)3Cl3
- C. Co(NH3)5Cl3
- D. Co(NH3)6Cl3
Explanation: Werner's theory.[Co(NH3)3Cl3] is non electrolyte. statement of theory: Negative ions satisfy the primary valances, which are generally…
Correct answer: Co(NH3)3Cl3- A. 36
- B. 38
- C. 28
- D. 54
Explanation: Effective atomic no. (EAN) = at. no. of central atom - oxidation state + 2 × (no. of ligands) = 28 - 0 + 2 × 4 = 36.
Correct answer: 36- A. 46
- B. 86
- C. 36
- D. 84
Explanation: EAN = atomic no. of the metal - no. of electron lost in ion formation + no.
Correct answer: 86- A. optionA.
- B. Option B
- C. Option C
- D. Option D
Explanation: Greater the value of stability constant, the stronger is the ligand.
Correct answer: Option B10818. Mohr's salt is a:
- A. Simple salt.
- B. Complex salt.
- C. Complex ion.
- D. Double salt.
Explanation: The union of two or more molecules of simple salts, when combined through electrostatic forces of attraction, combine with each other…
Correct answer: Double salt.- A. Al+
- B. H
- C. H-
- D. None.
Explanation: A ligand is a molecule or ion that binds to a metal atom to form a complex ion.
Correct answer: H-10820. Which has a complex anion?
- A. Na3AlF6
- B. K2SiF6
- C. K2PtCl6
- D. All
Explanation: A complex anion is an anion that contains a metal atom surrounded by ligands.
Correct answer: K2PtCl6