POST UTME MADONNA UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The atomic number of an element is 26. What is the electronic configuration of this element?
A. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^2
B. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^4
C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^6
D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^8
Question 2
A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?
A. MgO
B. CaO
C. Al2O3
D. Fe2O3
Question 3
A 1.00 L flask contains 0.500 M HCl(aq) and 0.500 M NaOH(aq). What is the concentration of the resulting solution after the reaction is complete?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 4
A 1.00 L flask contains 0.500 M HCl(aq) and 0.500 M NaOH(aq). What is the concentration of the resulting solution after the reaction is complete?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 5
A 25.0 mL sample of a solution containing 0.100 M CuSO4(aq) is titrated with 0.100 M NaOH(aq). What is the volume of NaOH(aq) required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) + O2(g) → CO2(g).
A. -393.5 kJ/mol
B. -393.0 kJ/mol
C. -392.5 kJ/mol
D. -392.0 kJ/mol
Question 7
A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?
A. MgO
B. CaO
C. Al2O3
D. Fe2O3
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.51 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C(s) to produce CO2(g).
A. -393.51 kJ/mol
B. -393.51 kJ/mol + 1.00 kJ/mol
C. -393.51 kJ/mol - 1.00 kJ/mol
D. -393.51 kJ/mol + 2.00 kJ/mol
Question 9
A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the pH of the solution?
A. 13.5
B. 14.5
C. 15.5
D. 16.5
Question 10
The reaction of cyclohexane with bromine in the presence of light is an example of a substitution reaction. What is the major product of this reaction?
A. 1-bromocyclohexane
B. cis-1,2-dibromocyclohexane
C. trans-1,2-dibromocyclohexane
D. cyclohexene
Question 11
A solution of NaOH is added to a solution of HCl. The resulting solution is a salt of which of the following metals?
A. Na
B. Ca
C. Mg
D. Al
Question 12
The half-life of a radioactive subs\tance is 5.0 years. If the initial activity is 100 Bq, calculate the activity after 10 years.
A. ( 25 ) Bq
B. ( 50 ) Bq
C. ( 75 ) Bq
D. ( 100 ) Bq
Question 13
A solution of HCl is added to a solution of NaOH. The resulting solution is a salt of which of the following metals?
A. Na
B. Ca
C. Mg
D. Al
Question 14
A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?
A. MgO
B. CaO
C. Al2O3
D. Fe2O3
Question 15
The diagram below shows a titration curve for the reaction of a strong acid with a weak base. What is the pH of the solution at point A?
A. 7.0
B. 9.0
C. 10.0
D. 12.0

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