POST UTME EKSU 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 25 cm³ of the HCl solution is required to reach the equivalence point, what is the volume of the NaOH solution required to reach the equivalence point?
A. 25 cm³
B. 50 cm³
C. 75 cm³
D. 100 cm³
Question 2
A 2.0 L solution of 0.5 M CH3CH2OH is mixed with a 1.0 L solution of 0.2 M HCl. What is the concentration of CH3CH2OH in the resulting solution?
A. 0.25 M
B. 0.3 M
C. 0.35 M
D. 0.4 M
Question 3
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0125 mol
B. 0.0250 mol
C. 0.0375 mol
D. 0.0500 mol
Question 4
A diagram of a gas apparatus is shown below.
A. The flask contains the gas.
B. The tube contains the gas.
C. The flask contains the liquid.
D. The tube contains the liquid.
Question 5
A 2.5 g sample of a non-metallic oxide is dissolved in 50 cm³ of water. If the resulting solution has a pH of 3.5, what is the molar mass of the oxide?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 6
A sample of nitrogen gas is collected over water at 25.0°C and 1.00 atm. What is the partial pressure of the nitrogen gas?
A. 0.950 atm
B. 0.975 atm
C. 1.00 atm
D. 1.05 atm
Question 7
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 8
A 1.0 M solution of NaCl is electrolyzed u\sing a current of 1.0 A for 2.0 hours. What is the mass of Cl2 gas produced?
A. 0.5 g
B. 1.0 g
C. 2.0 g
D. 4.0 g
Question 9
A diagram of a titration apparatus is shown below.
A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.
Question 10
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A metal (X) has a s\tandard reduction potential of +0.80 V. What is the s\tandard reduction potential of the metal ion \( X+ \)?
A. -0.80 V
B. +0.80 V
C. +1.60 V
D. +2.00 V
Question 12
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in water to make 1.0 L of solution. What is the molarity of the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 13
A 2.5 L solution of 0.2 M NaCl is mixed with a 1.5 L solution of 0.1 M NaCl. What is the concentration of NaCl in the resulting solution?
A. 0.15 M
B. 0.18 M
C. 0.2 M
D. 0.25 M
Question 14
A diagram of the apparatus used to determine the molar mass of a gas is shown below. What is the purpose of the U-tube manometer?
A. to measure the pressure of the gas
B. to measure the volume of the gas
C. to measure the temperature of the gas
D. to measure the molar mass of the gas
Question 15
A 2.0 g sample of a metal is heated in air to produce a metal oxide. If the mass of the metal oxide produced is 3.5 g, calculate the percentage yield of the reaction.
A. 50%
B. 60%
C. 70%
D. 80%

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