POST UTME BOWEN UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1 M solution of glu\cose is diluted to 0.1 M. What is the volume of the solution that contains 10 g of glu\cose?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 2
A diagram shows a titration setup with a burette containing 0.1 M HCl and a flask containing 25 mL of 0.05 M NaOH. If the initial pH of the solution is 7, what is the pH after the addition of 20 mL of HCl?
A. pH 2
B. pH 3
C. pH 4
D. pH 5
Question 3
The diagram below shows a titration setup. Identify the burette.
A. A
B. B
C. C
D. D
Question 4
A sample of oxygen gas (O2) has a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 25°C. What is the volume of the oxygen gas at a pressure of 3.0 atm and a temperature of 50°C?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 5
A solution contains 0.500 g of CaCO3. If 25.0 mL of this solution is diluted to 100.0 mL, what is the concentration of the resulting solution?
A. 0.0100 M
B. 0.0200 M
C. 0.0500 M
D. 0.100 M
Question 6
A 2.0 g sample of a non-metallic element is heated in a stream of oxygen gas. The resulting product is a white solid that is soluble in water. What is the identity of the non-metallic element?
A. Sulfur
B. Phosphorus
C. Chlorine
D. Bromine
Question 7
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 8
A gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 76.2 mmHg
B. 23.8 mmHg
C. 1 atm
D. 760 mmHg
Question 9
The reaction between nitrogen dioxide (NO2) and water (H2O) produces nitric acid (HNO3) and nitric oxide (NO). The equation for this reaction is: NO2 + H2O → HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
A. NO2
B. H2O
C. HNO3
D. NO
Question 10
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. If the reaction is represented by the equation: NaOH + HCl → NaCl + H2O, what is the volume of HCl required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100.0 mL
Question 11
The reaction between benzene (C6H6) and bromine (Br2) produces a dibrominated product. Write the balanced chemical equation for this reaction and identify the major product.
A. C6H5Br + C6H5Br
B. C6H5Br + C6H5Br2
C. C6H5Br + C6H5Br3
D. C6H5Br + C6H5Br4
Question 12
A 2.5 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. The resulting solution is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the metal?
A. 50
B. 100
C. 150
D. 200
Question 13
Determine the oxidation state of chromium in the compound K2Cr2O7.
A. +3
B. +2
C. +6
D. +1
Question 14
The half-life of a radioactive subs\tance is 5.0 days. If a sample initially contains 1000 mg of the subs\tance, how much will remain after 20 days?
A. 250 mg
B. 500 mg
C. 750 mg
D. 1000 mg
Question 15
The reaction of sodium hydroxide with acetic acid is represented by the equation: CH3COOH + NaOH → CH3COONa + H2O. If 25.0 mL of 0.100 M CH3COOH is mixed with 25.0 mL of 0.100 M NaOH, what is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M

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