POST UTME UNILORIN 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl_{2} → MCl_{2}. Identify the metal M.
A. Na
B. K
C. Ca
D. Mg
Question 2
The reaction between sulfuric acid and sodium hydroxide is a neutralization reaction. If 25.0 mL of 1.0 M H2SO4 is mixed with 25.0 mL of 1.0 M NaOH, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 3
A 2.00 M solution of $\text{H}_2$SO$_4$ is titrated with 0.500 M $\text{NaOH}$. What is the pH of the solution after 25.0 mL of $\text{NaOH}$ has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
The pH of a solution is 4. What is the concentration of hydrogen ions in the solution?
A. 1.0 x 10^-4 M
B. 1.0 x 10^-5 M
C. 1.0 x 10^-6 M
D. 1.0 x 10^-7 M
Question 5
A 1.00 L flask contains 0.500 mol of $\text{H}_2$ at 25.0°C. What is the partial pressure of $\text{H}_2$ in the flask?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 3.00 atm
Question 6
A 2.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, calculate the number of moles of HCl present in the original solution.
A. 0.0500 mol
B. 0.0505 mol
C. 0.0510 mol
D. 0.0515 mol
Question 7
A sample of oxygen gas occupies a volume of 1.0 L at a pressure of 2.0 atm. What is the volume of the gas if the pressure is increased to 4.0 atm?
A. 0.5 L
B. 1.0 L
C. 1.5 L
D. 2.0 L
Question 8
A 1.00 L solution of $\text{H}_2$O contains 0.500 g of $\text{CaCl}_2$. What is the concentration of $\text{Ca}^{2+}$ ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 9
A 1.00-g sample of a polymer is dissolved in 100.0 mL of a solvent. If the polymer has a molar mass of 3.00 x 10^4 g/mol and the density of the solution is 1.10 g/mL, calculate the number of moles of polymer present in the solution.
A. 0.0333 mol
B. 0.0335 mol
C. 0.0337 mol
D. 0.0339 mol
Question 10
A redox reaction involves the oxidation of \( Fe^{2+} \) to \( Fe^{3+} \) and the reduction of \( MnO_4^- \) to \( Mn^{2+} \). What is the oxidation number of manganese in \( MnO_4^- \)?
A. +2
B. +4
C. +6
D. +8
Question 11
Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + 3H2O(l) → 2Al(OH)3(s) + 3H2(g) given that ΔH° for the formation of Al(OH)3 is -3265.6 kJ/mol and ΔH° for the formation of H2 is 0 kJ/mol
A. -3265.6 kJ/mol
B. -3265.6 kJ/mol + 3\( 0 kJ/mol \)
C. -3265.6 kJ/mol + 3\( 0 kJ/mol \)
D. -3265.6 kJ/mol + 3\( 0 kJ/mol \)
Question 12
A 2.50-g sample of a polymer is dissolved in 50.0 mL of a solvent. If the polymer has a molar mass of 1.50 x 10^5 g/mol and the density of the solution is 1.20 g/mL, calculate the number of moles of polymer present in the solution.
A. 0.0170 mol
B. 0.0175 mol
C. 0.0180 mol
D. 0.0185 mol
Question 13
A solution of 0.5 M NaCl is prepared by dissolving 25.0 g of NaCl in 1.0 L of water. What is the concentration of Na+ ions in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 14
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. The reaction is as follows: NaOH + HCl → NaCl + H_{2}O. What is the pH of the solution after the reaction is complete?
A. 7
B. 9
C. 11
D. 13
Question 15
A diagram of a cell is shown below. Identify the part labeled A
A. Mitochondria
B. Nucleus
C. Ribosome
D. Lysosome

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