POST UTME ABU 2020 Chemistry | Objective

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Question 1
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 2
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 3
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the concentration of HCl is 0.1 M.
A. 1
B. 2
C. 3
D. 4
Question 4
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 5
A 2.00 M solution of H$_2$SO$_4$ is mixed with a 1.00 M solution of NaOH. The reaction is as follows: H$_2$SO$_4$ + 2NaOH → Na$_2$SO$_4$ + 2H$_2$O. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 2.50 L flask contains 0.500 atm of N2 and 0.750 atm of O2 at 25°C. What is the partial pressure of O2 if 0.250 atm of N2 is removed?
A. 0.375 atm
B. 0.500 atm
C. 0.625 atm
D. 0.750 atm
Question 7
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 8
What is the molar mass of ethane (C2H6)?
A. 30 g/mol
B. 60 g/mol
C. 90 g/mol
D. 120 g/mol
Question 9
What is the density of a subs\tance with a mass of 50 g and a volume of 10 cm^3?
A. 5 g/cm^3
B. 10 g/cm^3
C. 15 g/cm^3
D. 20 g/cm^3
Question 10
A 10.0 g sample of a metal (M) is heated in a crucible until it melts. The resulting liquid is then cooled and solidified. What is the resulting solid?
A. The resulting solid is the same as the original metal.
B. The resulting solid is a different metal.
C. The resulting solid is a compound.
D. The resulting solid is a mixture.
Question 11
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 12
A 25 mL sample of 0.5 M NaOH is titrated with 1 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0125
B. 0.025
C. 0.05
D. 0.1
Question 13
A solution contains 0.1 M HCl and 0.1 M NaOH. Determine the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 14
A 0.100 M solution of sodium hydroxide (NaOH) is titrated with 0.100 M hydrochloric acid (HCl). Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 15
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

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