POST UTME LEAD CITY UNIVERSITY 2017 Chemistry | Objective

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Question 1
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in water to make 1.00 L of solution. What is the molarity of the solution if 25.0 g of NaOH is dissolved in 0.500 L of water?
A. 0.500 M
Correct B. 0.750 M
C. 1.00 M
D. 1.25 M

Correct Answer: B

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Question 2
What is the pH of a 0.100 M solution of HCl?
A. 0.100
B. 1.00
C. 2.00
Correct D. 3.00

Correct Answer: D

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Question 3
A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water to make 1.00 L of solution. What is the molarity of the solution if 40.0 g of NaOH is dissolved in 0.500 L of water?
A. 1.00 M
B. 2.00 M
C. 3.00 M
Correct D. 4.00 M

Correct Answer: D

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Question 4
What is the pH of a 0.0500 M solution of HCl?
A. 0.0500
B. 1.00
C. 2.00
Correct D. 3.00

Correct Answer: D

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Question 5
A 1.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water to make 1.00 L of solution. What is the molarity of the solution if 40.0 g of NaOH is dissolved in 0.500 L of water?
A. 0.500 M
B. 1.00 M
C. 1.50 M
Correct D. 2.00 M

Correct Answer: D

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Question 6
A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming ideal behavior?
A. 0.5 L
B. 1 L
Correct C. 2 L
D. 4 L

Correct Answer: C

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Question 7
A solution contains 0.1 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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Question 8
A 2.0 L flask contains 0.5 M HCl. What is the number of moles of HCl in the flask?
A. 0.1 mol
Correct B. 0.5 mol
C. 1.0 mol
D. 2.0 mol

Correct Answer: B

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Question 9
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 10
A 2.0 L flask contains 0.5 M HCl. What is the concentration of H+ ions in the flask?
A. 0.1 M
Correct B. 0.5 M
C. 1.0 M
D. 2.0 M

Correct Answer: B

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Question 11
Determine the major product of the reaction between 2-methylpropene and HCl.
Correct A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane

Correct Answer: A

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Question 12
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
Correct B. mol/L
C. mL/g
D. g/mol

Correct Answer: B

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Question 13
The rate cons\tant of a reaction is a measure of the rate at which the reaction occurs. What is the unit of the rate cons\tant?
A. mol/L/s
Correct B. L/mol/s
C. s
D. K

Correct Answer: B

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Question 14
The equilibrium cons\tant (K) is a measure of the ratio of the concentrations of the products to the concentrations of the reac\tants at equilibrium. What is the unit of the equilibrium cons\tant?
A. mol/L
Correct B. L/mol
C. s
D. K

Correct Answer: B

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Question 15
The half-life of a radioactive subs\tance is the time required for half of the initial amount of the subs\tance to decay. What is the unit of half-life?
Correct A. s
B. min
C. h
D. d

Correct Answer: A

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Question 16
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, and ΔHf(C(s)) = 0 kJ/mol.
Correct A. -1206.60 kJ/mol
B. -1206.19 kJ/mol
C. -1206.29 kJ/mol
D. -1206.41 kJ/mol

Correct Answer: A

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Question 17
A 2.50-g sample of a non-metallic element, X, reacts with oxygen to form 3.25 g of X2O5. Calculate the empirical formula of X.
A. O2S
B. OS2
Correct C. SO2
D. SO3

Correct Answer: C

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Question 18
A 25.0-mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. Calculate the pH of the resulting solution.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 19
A 50.0-g sample of a polymer, P, is dissolved in 100.0 mL of a solvent. The resulting solution has a vis\cosity of 0.500 Pa·s. Calculate the molar mass of P.
A. 500 g/mol
B. 1000 g/mol
Correct C. 2000 g/mol
D. 5000 g/mol

Correct Answer: C

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Question 20
A 10.0-mL sample of a solution containing 0.100 M Fe2+ ions is mixed with 10.0 mL of a solution containing 0.100 M S2- ions. Calculate the concentration of the resulting solution.
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 21
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is negligible.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 22
A sample of a non-metallic oxide, X2O3, has a molar mass of 160 g/mol. The oxide is found to be acidic in nature. Determine the identity of the non-metallic element, X.
A. Al
Correct B. Si
C. P
D. S

Correct Answer: B

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Question 23
A solution of NaOH is titrated with a solution of HCl. The initial pH of the NaOH solution is 12. The pH at the equivalence point is 7. Determine the concentration of the HCl solution.
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 24
A sample of a metal, M, has a molar mass of 120 g/mol. The metal reacts with chlorine gas to form a compound, MCl2. Determine the identity of the metal, M.
A. Ca
Correct B. Mg
C. Al
D. Zn

Correct Answer: B

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Question 25
A solution of H2SO4 is titrated with a solution of NaOH. The initial pH of the H2SO4 solution is 2. The pH at the equivalence point is 7. Determine the concentration of the NaOH solution.
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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