POST UTME BELLS UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The element with atomic number 12 is classified as a metal in the periodic table. What is the name of this element?
A. Magnesium
B. Silicon
C. Manganese
D. Copper
Question 2
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M AgNO3. What is the concentration of the chloride ion in the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 3
A 1.0 g sample of a metal is heated in a crucible until it melts. If the temperature of the metal is 800°C, calculate the energy required to melt the metal.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 4
A sample of a gas is analyzed and found to have a volume of 2.5 L at a pressure of 1.0 atm and a temperature of 298 K. What is the number of moles of gas present?
A. 0.01 mol
B. 0.1 mol
C. 1.0 mol
D. 10 mol
Question 5
In a reaction between nitric acid (HNO3) and sodium hydroxide (NaOH), the following equation is observed: 2HNO3 + 2NaOH → Na2NO3 + 2H2O + NO2. What is the oxidation state of nitrogen in the product NO2?
A. +3
B. +4
C. +5
D. +6
Question 6
A diagram of a spectrophotometer setup is shown below. What is the purpose of the detector in this setup?
A. To measure the absorbance of the solution
B. To measure the transmit\tance of the solution
C. To measure the concentration of the solution
D. To determine the pH of the solution
Question 7
A solution contains 20 g of glu\cose (C6H12O6) per 100 g of water. What is the molarity of the solution?
A. 1 M
B. 2 M
C. 3 M
D. 4 M
Question 8
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. Which of the following statements about this reaction is correct?
A. The reaction is an example of a free radical substitution reaction.
B. The reaction is an example of an electrophilic addition reaction.
C. The reaction is an example of a nucleophilic substitution reaction.
D. The reaction is an example of an elimination reaction.
Question 9
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 7
C. 10
D. 14
Question 10
A 2.0 L flask contains 0.5 mol of an ideal gas at 300 K. If the gas is transferred to a 1.0 L flask at 400 K, what is the new pressure?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 11
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?
A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -285.8 kJ/mol
Question 13
A 0.500 M solution of HCl(aq) is mixed with a 0.500 M solution of NaOH(aq). What is the concentration of the resulting solution?
A. 0.500 M
B. 1.00 M
C. 0.250 M
D. 0.750 M
Question 14
A diagram of a distillation setup is shown below. What is the purpose of the condenser in this setup?
A. To separate the components of the mixture
B. To identify the components of the mixture
C. To measure the concentration of the components
D. To determine the pH of the mixture
Question 15
The diagram below shows the atomic structure of an element. Identify the type of bonding that occurs between the atoms.
A. Ionic bonding
B. Covalent bonding
C. Metallic bonding
D. Hydrogen bonding

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