POST UTME ABU 2020 Chemistry | Objective

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Question 1
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.3 M
Question 2
What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-7 M?
A. 1
B. 7
C. 10
D. 14
Question 3
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. Calculate the pH of the solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 4
What is the molar mass of propane (C3H8)?
A. 44 g/mol
B. 60 g/mol
C. 80 g/mol
D. 100 g/mol
Question 5
The diagram below represents a titration setup. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To measure the pH of the solution
D. To measure the temperature of the solution
Question 6
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the concentration of the resulting solution?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 7
A 2.00 L flask contains 0.500 atm of CO2 at 25°C. What is the partial pressure of CO2 if 0.250 atm of N2 is added?
A. 0.375 atm
B. 0.500 atm
C. 0.625 atm
D. 0.750 atm
Question 8
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
A 2.50 g sample of a non-volatile solute is dissolved in 25.0 cm³ of water at 25°C. Calculate the molality of the solution.
A. 0.100 m
B. 0.200 m
C. 0.500 m
D. 1.00 m
Question 10
A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl$_2$ → MCl$_2$. If 2.50 g of M is reacted with 1.00 g of Cl$_2$, what is the limiting reac\tant?
A. M
B. Cl$_2$
C. Neither M nor Cl$_2$ is the limiting reac\tant.
D. Insufficient information to determine the limiting reac\tant.
Question 11
A reaction is represented by the equation: 2A + B → 2C + D. If 2 moles of A and 1 mole of B are present, what is the limiting reac\tant?
A. A
B. B
C. C
D. D
Question 12
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4
Question 13
A 5.00 g sample of a metal (M) is reacted with a 10.0 g sample of a non-metal (N) to form a compound. The reaction is as follows: M + N → MN. What is the empirical formula of the resulting compound?
A. M$_2$N
B. MN
C. N$_2$M
D. The empirical formula cannot be determined.
Question 14
What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-5 M?
A. 1
B. 5
C. 7
D. 9
Question 15
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL

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