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CHEM 121 ACS FINAL MOCK EXAM KEY 2025 2026. QUESTIONS WITH 100%CORRECT ANSWERS. A+ GRADE GUARANTEED. 1. Which pair of compounds will form hydrogen bonds with one another? a. CH4 and H2O b. CH4 and NH3 c. HF and CH4 d. H2O and NH3 (ANS) 2. Which substance is most soluble in water? a. ethane, CH3CH3 b. ethanol, CH3CH2OH (ANS) c. n-butane, CH3CH2CH2CH3 d. 1-butanol, CH3CH2CH2CH2OH
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