POST UTME LAUTECH 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 2
A 1.0 M solution of glu\cose (C6H12O6) is placed in a 1.0 L flask and allowed to reach equilibrium with the atmosphere. If the partial pressure of CO2 is 0.1 atm, calculate the concentration of glu\cose remaining in the solution.
A. 0.5 M
B. 0.6 M
C. 0.7 M
D. 0.8 M
Question 3
Determine the molar solubility of AgCl in a solution containing 0.1 M NaCl. The solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \).
A. 1.0 × 10^\( -5 \) M
B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 3.0 × 10^\( -5 \) M
Question 4
A 2.0 L flask contains 0.50 mol of an ideal gas at 25°C. If the gas is heated to 50°C at cons\tant volume, what is the new pressure?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 5
A metal (X) reacts with dilute HCl to produce a gas that turns lime water milky. The metal is likely to be
A. Zn
B. Fe
C. Cu
D. Ag
Question 6
A 0.500 M solution of calcium chloride (CaCl2) is prepared by dissolving 25.0 g of CaCl2 in water and diluting to a total volume of 1.00 L. What is the molarity of the resulting solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 7
A 10.0 g sample of a polymer is dissolved in 100.0 mL of a solvent. If the polymer has a molecular weight of 50,000 g/mol, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.10 g/L
C. 0.20 g/L
D. 0.50 g/L
Question 8
A solution contains 0.10 M glu\cose (C6H12O6) and 0.20 M fructose (C6H12O6). What is the total molarity of the solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 9
A 0.500 M solution of hydrochloric acid (HCl) is prepared by dissolving 25.0 g of HCl in water and diluting to a total volume of 1.00 L. What is the pOH of the resulting solution?
A. 12.0
B. 13.0
C. 14.0
D. 15.0
Question 10
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 11
A solution containing 0.1 M $\text{Fe}^{2+}$ ions is mixed with a solution containing 0.1 M $\text{SCN}^-$ ions. What is the concentration of the complex ion $\text{[Fe(SCN)]}^+$ formed?
A. 0.01
B. 0.05
C. 0.1
D. 0.2
Question 12
A solution of 0.1 M HCl is prepared by dissolving 3.0 g of HCl in 100 mL of water. What is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 13
A 0.1 M solution of HCl is prepared by dissolving 0.1 mol of HCl in 1 L of water. What is the concentration of H+ ions in the solution?
A. 0.1 M
B. 0.05 M
C. 0.025 M
D. 0.0125 M
Question 14
A 2.5 M solution of NaOH is mixed with a 2.5 M solution of HCl. What is the resulting pH of the solution?
A. 7
B. 9
C. 10
D. 12
Question 15
A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2M2O3. What is the oxidation state of M in M2O3?
A. 2
B. 3
C. 4
D. 5

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