POST UTME ELIZADE UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME ELIZADE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(Ca(s)) = 0 kJ/mol.
Correct A. -1206.60 kJ/mol
B. -1206.10 kJ/mol
C. -1207.10 kJ/mol
D. -1207.60 kJ/mol

Correct Answer: A

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Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 15.0 mL of NaOH has been added.
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

Correct Answer: B

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Question 3
A solution contains 0.500 M NaCl. Calculate the molar solubility of NaCl.
Correct A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M

Correct Answer: A

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Question 4
A 2.50 g sample of a subs\tance is found to have a mass of 2.00 g after being placed in a 100 mL beaker. Calculate the mass of the beaker.
A. 0.500 g
Correct B. 1.00 g
C. 1.50 g
D. 2.00 g

Correct Answer: B

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Question 5
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M HCl is titrated with 0.100 M NaOH, what is the pH of the solution after 15.0 mL of NaOH has been added?
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

Correct Answer: B

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Question 6
Determine the number of unpaired electrons in the ground state of the chromium atom, given that the electron configuration is [Ar] 3d5 4s1.
Correct A. 1
B. 3
C. 5
D. 7

Correct Answer: A

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Question 7
A 2.5 M solution of HCl is mixed with a 1.2 M solution of NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.006 mol
Correct B. 0.012 mol
C. 0.018 mol
D. 0.024 mol

Correct Answer: B

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Question 8
A metal M has an electron configuration of [Kr] 5s1 4d10. Identify the metal and describe its electronic configuration.
A. Zn
B. Cd
Correct C. Hg
D. Ag

Correct Answer: C

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Question 9
A 1.0 M solution of Fe2+ is mixed with a 1.2 M solution of OH- ions. Calculate the pH of the resulting solution.
A. 2.5
B. 3.5
C. 4.5
Correct D. 5.5

Correct Answer: D

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Question 10
A 2.5 M solution of HCl is mixed with a 1.2 M solution of NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.006 mol
Correct B. 0.012 mol
C. 0.018 mol
D. 0.024 mol

Correct Answer: B

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Question 11
Determine the oxidation state of nitrogen in the compound NO2.
A. +1
B. +2
Correct C. +3
D. +4

Correct Answer: C

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Question 12
The compound SO2 is a pollu\tant released into the atmosphere. What is the major environmental impact of SO2?
Correct A. Acid rain
B. Global warming
C. Ozone depletion
D. Atmospheric pollution

Correct Answer: A

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Question 13
The compound C6H12O6 is a type of sugar. What is the molecular formula for this compound?
A. C5H11O5
Correct B. C6H12O6
C. C7H14O7
D. C8H16O8

Correct Answer: B

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Question 14
The compound H2O is a type of polar molecule. What is the dipole moment of this molecule?
A. 0 D
Correct B. 1.8 D
C. 2.2 D
D. 3.0 D

Correct Answer: B

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Question 15
The compound CH4 is a type of hydrocarbon. What is the molecular formula for this compound?
A. C2H6
B. C3H8
C. C4H10
Correct D. C5H12

Correct Answer: D

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Question 16
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation: $\text{CaC}_2(s) \rightarrow \text{Ca}(s) + \text{C}(s) + \text{CO}_2(g)$
A. 0.050 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 17
A metal (X) reacts with $\text{HCl}$ to produce a gas that turns $\text{KMnO}_4$ solution from colorless to brown. Identify the metal X and the gas produced.
A. $\text{Zn} \rightarrow \text{ZnCl}_2 + \text{H}_2$
Correct B. $\text{Fe} \rightarrow \text{FeCl}_2 + \text{H}_2$
C. $\text{Cu} \rightarrow \text{CuCl}_2 + \text{H}_2$
D. $\text{Ag} \rightarrow \text{AgCl} + \text{H}_2$

Correct Answer: B

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Question 18
A solution of $\text{NaOH}$ is mixed with a solution of $\text{HCl}$ in a 1:1 ratio. What is the resulting solution?
Correct A. $\text{NaCl} + \text{H}_2\text{O}$
B. $\text{NaCl} + \text{H}_2\text{O} + \text{NaOH}$
C. $\text{NaCl} + \text{H}_2\text{O} + \text{HCl}$
D. $\text{NaCl} + \text{H}_2\text{O} + \text{NaHCl}_2$

Correct Answer: A

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Question 19
A polymer is made up of repeating units of $\text{C}_6\text{H}_4\text{O}_2$ linked together. What is the polymer?
A. $\text{Polyethylene}$
B. $\text{Polypropylene}$
Correct C. $\text{Polyvinyl chloride}$
D. $\text{Polyacrylonitrile}$

Correct Answer: C

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Question 20
A sample of $\text{CO}_2$ gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the volume of the gas at STP?
Correct A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L

Correct Answer: A

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Question 21
The rate cons\tant (k) for a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 298 K, calculate the value of k when A = 1.0 s^\( -1 \) and the reaction rate cons\tant is 0.1 s^\( -1 \).
A. 0.5 s^\( -1 \)
Correct B. 0.1 s^\( -1 \)
C. 1.0 s^\( -1 \)
D. 2.0 s^\( -1 \)

Correct Answer: B

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Question 22
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in 100 mL of water. Calculate the molarity of the solution.
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 23
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) from the following reaction: H2(g) + 1/2 O2(g) → H2O(l).
A. -285.8 kJ/mol
B. -393.5 kJ/mol
Correct C. -241.8 kJ/mol
D. -572.3 kJ/mol

Correct Answer: C

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Question 24
A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. Calculate the pH of the solution.
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 25
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in 100 mL of water. Calculate the pOH of the solution.
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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