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Here are the solutions to your multiple-choice questions: Q1: Choose the correct option and write A,B,C or D in the box at the end of each MCQ. i) Thermodynamics stability of complexes deals with, (A) value of stability constant (B) bond energies of M-L bonds (C) both A&B (D) all of these Explanation: Thermodynamic stability of complexes is determined by both the equilibrium constant (stability constant) and the strength of the metal-ligand bonds. Correct Option: (C) both A&B ii) Greater the charge to radius ratio of central metal ion...... will the stability of complex (A) Higher (B) Blower (C) no effect (D) all of these Explanation: A higher charge-to-radius ratio indicates a greater charge density on the metal ion, leading to stronger electrostatic attraction with ligands and thus a more stable complex. Correct Option: (A) Higher iii) Which of the following will form stable complexes? (A) Cl^- (B) Br^- (C) F^- (D) all of these Explanation: Among the halide ligands, F^- is the smallest and most electronegative, making it a "hard" ligand that forms stronger bonds and more stable complexes with many metal ions compared to Cl^- or Br^-. Correct Option: (C) F^- iv) John Teller-distortion applied to complexes of, (A) symmetrical electronic configuration (B) symmetrical E.C (C) regular tetragonal (D) all of these Explanation: Jahn-Teller distortion occurs in complexes with unsymmetrical* electronic configurations in degenerate orbitals, leading to a distortion from ideal geometry, often resulting in a tetragonal (elongated or compressed octahedral) geometry. Correct Option: (C) regular tetragonal v) The reaction in which solid is separated from solution is known as. (A) metathetical (B) solvolytic (C) redox (D) none Explanation: The process where a solid separates from a solution is called precipitation. Metathetical reactions (double displacement reactions) frequently lead to the formation of a precipitate. Correct Option: (A) metathetical vi) The number of optical isomers formed by complex with formula M[ABCDEF] are (A) 15 (B) 3 (C) 10 (D) 30 Explanation: An octahedral complex with six different monodentate ligands (MABCDEF) has 15 possible geometric isomers. Each of these 15 geometric isomers is chiral and exists as a pair of enantiomers. Therefore, the total number of optical isomers is 15 × 2 = 30. Correct Option: (D) 30 vii) The isomerism exhibit due different donor atoms of the same ligands is (A) ionization (B) ligand (C) linkage (D) coordination Explanation: This describes linkage isomerism, where an ambidentate ligand can bind to the metal center through two or more different donor atoms. Correct Option: (C) linkage viii) Which of the following complexes do not show geometrical isomerism? (A) tetrahedral (B) square planner (C) octahedral (D) both A & B Explanation: Tetrahedral complexes do not exhibit geometrical isomerism because all ligand positions are equidistant and equivalent relative to each other. Any arrangement of ligands can be rotated to superimpose on another. Correct Option: (A) tetrahedral ix) The nature of metal ligand bond in CFT is (A) covalent (B) electrostatics (C) metallic (D) all Explanation: In Crystal Field Theory (CFT), the metal-ligand bond is considered to be purely electrostatic, arising from the attraction between the positively charged metal ion and the negatively charged ligands (or the negative end of polar ligands). Correct Option: (B) electrostatics x) Which of the following does not show optical isomerism? (A) tetrahedral (B) square planner (C) octahedral (D) both A & B Explanation: Square planar complexes typically possess at least one plane of symmetry (or a center of inversion), which makes them achiral and thus unable to exhibit optical isomerism. Correct Option: (B) square planner 3 done, 2 left today. You're making progress.