80. Consider the reaction CO₂(g) + 2H₂O(g) → CH₄(g) + 2O₂(g) with ΔH° = 803 kJ. Which of the following options will increase K?
(A) increasing the temperature of system
(B) decreasing the number of moles of methane
(C) increasing the volume of system
(D) increasing the number of moles of CO2
(E) none of the above

87. For the reaction, CO2(g) + 2H2O(g) → CH4(g) + 2O2(g), AH° = 803 kJ, which of the following will increase K? (A) increasing the temperature of system (B) decreasing the number of moles of methane (C) increasing the volume of system (D) increasing the number of moles of CO2 (E) none of the above

21. For the reaction: CO2(g) + 2H2O(g) → CH4(g) + 2O2(g), ΔH° = 803 kJ Which of the following will increase K? (A). decreasing the temperature of system (B). decreasing the number of moles of methane (C). increasing the volume of system (D). increasing the temperature of system (E). none of these

81. Metal carbonyl complexes are studied in the context of potential therapeutic CO delivery in medicine as carbon monoxide-releasing molecules (CORMs). Predict which CO ligand in the following complexes has the highest CO stretching frequency (νCO in IR spectroscopy). (A) bridging CO of Fe2(CO)9 (B) [Mn(CO)6]+ (C) (CO)5Cr=C(OMe)Ph (a Fischer carbene complex) (D) [V(CO)6]- (E) fac-Cr(CO)3(NH3)3

82. Bio-organometallic carbonyl complexes can release CO in vivo for therapeutic effects, such as reducing inflammation, pain, and oxidative stress. Which property makes a metal carbonyl complex suitable as a therapeutic CORM? (A) Extreme kinetic inertness, preventing CO release (B) The ability to release CO under physiological conditions (triggered by light or ligand exchange) (C) High toxicity due to rapid metal dissociation (D) Strong irreversible metal-protein binding (E) The presence of only organic ligands and no metal ions

83. Which point group best describes the symmetry of the staggered conformation of ferrocene (an organometallic scaffold sometimes explored in drug design)? (A) D5d (B) D5h (C) S5 (D) C5v (E) D5

84. In medicinal chemistry, the stereochemistry of coordination complexes can strongly influence their biological activity. Consider the complex [Co(en)2Cl2]+, where en = ethylenediamine, a ligand often used in metal-based drug design. How many stereoisomers are possible for the complex [Co(en)2Cl2]+? For this question, treat the chelate ring formed by the en ligand as planar. (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

85. A sample solution is analyzed using a UV-Vis spectrophotometer. Under specific experimental conditions, 80.0% of the incident light is either absorbed or scattered and fails to reach the detector. What is the absorbance ( A ) of this solution (given log2≈ 0.30; log4≈ 0.60; log6≈ 0.78; log8≈0.90)? (A) 0.100 (B) 0.200 (C) 0.700 (D) 0.800 (E) 0.400

86. Rhenium complexes, including those with metal-metal bonds, are widely studied in medicinal inorganic chemistry for applications in nuclear medicine (e.g., 186Re and 188Re radioisotopes for cancer radiotherapy) and as potential redox-active therapeutic agents. When [Re2Cl8]2- is reduced by one electron, what is the metal-metal (Re-Re) bond order of the new complex? (A) 3 (B) 3.5 (C) 4 (D) 4.5 (E) None of the above

87. In infrared (IR) spectroscopy, a specific absorption peak is observed at a wavelength of 2.50 μm. What are the corresponding wavenumber in cm-1 and frequency in Hz for this radiation (Speed of light, c=3.00×108 m/s)? (A) 400 cm-1 and 1.20×1013 Hz (B) 4000 cm-1 and 1.20×1014 Hz (C) 4000 cm-1 and 7.50×1014 Hz (D) 2500 cm-1 and 1.20×1014 Hz (E) 40000 cm-1 and 1.20×1015 Hz

88. Choose the correct statement. (A) Exothermic reactions are always spontaneous. (B) A reaction that exhibits a negative value of ΔS may be spontaneous. (C) Free energy is independent of temperature. (D) At constant pressure and temperature, a decrease in free energy ensures an increase in the entropy of the system. (E) None of the above.

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