POST UTME UNN 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M NaOH is added to 25.0 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 7
B. 2
C. 10
D. 14
Question 2
The s\tandard enthalpy of formation of CH4(g) is -74.8 kJ/mol. What is the s\tandard enthalpy of formation of C(s)?
A. 0 kJ/mol
B. 74.8 kJ/mol
C. -74.8 kJ/mol
D. 117.2 kJ/mol
Question 3
A metal (M) reacts with oxygen (O2) to form a metal oxide (MO). The balanced equation for the reaction is: 4M + 3O2 → 2MO. If 2.00 g of M is reacted with 3.00 g of O2, what is the mass of MO formed?
A. 2.00 g
B. 4.00 g
C. 6.00 g
D. 8.00 g
Question 4
A 0.500 M solution of sodium hydroxide (NaOH) is mixed with 0.500 M solution of hydrochloric acid (HCl). What is the resulting pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 5
A 0.500 M solution of sodium hydroxide (NaOH) is mixed with 0.500 M solution of hydrochloric acid (HCl). What is the resulting concentration of sodium chloride (NaCl) in the solution?
A. 0.500 M
B. 0.750 M
C. 1.000 M
D. 1.250 M
Question 6
The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303 \frac{t}{t_1/2}. If the half-life \( t1/2 \) of the reaction is 10.0 minutes, and the time (t) is 20.0 minutes, what is the value of k?
A. 0.2303 min^-1
B. 2.303 min^-1
C. 23.03 min^-1
D. 230.3 min^-1
Question 7
A 0.05 M solution of H2SO4 is titrated with 0.05 M NaOH. If 50 mL of NaOH is required to reach the equivalence point, what is the volume of H2SO4 used?
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 8
The rate cons\tant (k) for a first-order reaction is given by the equation \( k = Ae^{-E_a/RT} \). If the activation energy \( E_a \) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 298 K, what is the value of A?
A. 1.0 x 10^10
B. 1.0 x 10^5
C. 1.0 x 10^2
D. 1.0 x 10^-5
Question 9
A 1.00 M solution of sodium hydroxide (NaOH) is titrated with a 1.00 M solution of hydrochloric acid (HCl). If 25.0 mL of NaOH is titrated with 25.0 mL of HCl, what is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 10
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in water and diluting to 1 L. What is the molarity of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
A diagram of a chemical apparatus is shown below. If the apparatus is used to measure the volume of a gas, what is the name of the apparatus?
A. Burette
B. Test Tube
C. Beaker
D. Flask
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 CO(g)?
A. 117.2 kJ/mol
B. -117.2 kJ/mol
C. 117.2 kJ/mol
D. -393.5 kJ/mol
Question 13
A sample of O2 gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure. What is the new volume of the gas, given that the initial volume is 2.5 L?
A. 6.5 L
B. 8.5 L
C. 10.5 L
D. 12.5 L
Question 14
A sample of hydrogen gas (H2) is collected over water at a temperature of 25°C and a pressure of 1.00 atm. The partial pressure of water vapor \( P_H2O \) is 0.0313 atm. What is the total pressure \( P_total \) of the gas mixture?
A. 0.9687 atm
B. 0.9697 atm
C. 0.9717 atm
D. 0.9737 atm
Question 15
A 2 L solution of 0.2 M NaOH is prepared by dissolving 40 g of NaOH in water. What is the molarity of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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