ACS EXAM (2024 version) Practice Questions and Answers

ACS EXAM (2024 version) Practice Questions and Answers A 20.0 g sample of mercury(II) oxide (HgO, M = 216.6) is heated strongly, causing it to decompose to metallic Hg and O2 gas. What volume of O2 gas is produced (measured at STP)? (A) 1.03 L (B) 2.07 L (C) 4.14 L (D) 14.0 L - ️️ Correct-A When 30.0 mL of 0.10 M AgNO3 is added to 30.0 mL of 0.10 M NaCl, aqueous NaNO3 and solid AgCl are formed. How much solid AgCl is produced? (A) 0.0030 mol (B) 0.0060 mol (C) 0.030 mol (D) 0.060 mol - ️️ Correct-A How much Sr(OH)2 • 8 H2O (M = 265.76) is needed to TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 2/25 prepare 250.0 mL of solution in which [OH-] = 0.100 M? (A) 3.32 g (B) 6.64 g (C) 9.97 g (D) 13.3 g - ️️ Correct-A A 10.00 g sample of a compound containing only carbon, hydrogen, and oxygen forms 23.98 g CO2 and 4.91 g H2O upon complete combustion. What is the empirical formula of the compound? (A) C2HO (B) C3H3O (C) C6H3O2 (D) C6H6O - ️️ Correct-B Which of the following is a nonelectrolyte in aqueous solution? (A) H2SO4 (B) NaC2H3O2 (C) K2CO3 (D) CH2O - ️️ Correct-D TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 3/25 An aqueous solution of potassium sulfate (K2SO4) has a freezing point of -2.24 ºC. What is its molality? (Kf = 1.86 ºC•m-1) (A) 0.401 m (B) 0.602 m (C) 1.20 m (D) 4.17 m - ️️ Correct-A Dissolution of which salt in water results in a decrease in the temperature of the solution? A) KHSO4 (B) NaOH (C) AlCl3 (D) NH4NO3 - ️️ Correct-D What is observed when equal volumes of 0.1 M aqueous HCl and 0.01 M aqueous Na2SO3 are mixed? (A) Colorless solution and a white precipitate (B) Colored solution and a white precipitate (C) Colorless solution and a colored precipitate TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 4/25 (D) Colorless solution, no precipitate, and gas evolution - ️️ Correct-D Which combination of dilute aqueous reagents will not produce a precipitate? (A) AgNO3 + HCl (B) NaOH + HClO4 (C) BaBr2 + Na2SO4 (D) ZnI2 + KOH - ️️ Correct-B A solution of a salt of which metal produces a bright red color in a flame test? (A) Lithium (B) Sodium (C) Potassium (D) Copper - ️️ Correct-A Which cation forms a colorless aqueous solution?