POST UTME MADONNA UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. What is the new volume of the gas?
A. 2.00 L
B. 4.00 L
C. 8.00 L
D. 16.00 L
Question 2
The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100g, how much of the subs\tance will remain after 10 years?
A. 50g
B. 75g
C. 87.5g
D. 100g
Question 3
A 0.50 M solution of HCl is mixed with a 0.50 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 4
A solution of NaOH is titrated with HCl. The initial pH of the solution is 10. If 50 mL of 0.1 M HCl is added, what is the new pH?
A. 6.00
B. 7.00
C. 8.00
D. 9.00
Question 5
A 2.50-g sample of a metal is heated in a crucible until it is completely vaporized. If the vapor density of the metal is 10.0 g/L, what is the molar mass of the metal?
A. 50.0 g/mol
B. 60.0 g/mol
C. 70.0 g/mol
D. 80.0 g/mol
Question 6
A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 1:1
B. 2:1
C. 3:1
D. 4:1
Question 7
A solution of NaOH is titrated with HCl. The initial pH of the solution is 10. If 25 mL of 0.1 M HCl is added, what is the new pH?
A. 7.00
B. 8.00
C. 9.00
D. 10.00
Question 8
What is the change in entropy when 1 mole of an ideal gas expands from 1 L to 2 L at cons\tant temperature?
A. -22.4 J/K
B. 22.4 J/K
C. -11.2 J/K
D. 11.2 J/K
Question 9
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 10
The reaction of hydrogen with oxygen is represented by the equation: \( 2H_2\( g \ \) + O_2(g) \rightarrow 2H_2O(l) ). What is the type of reaction?
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
D. Double displacement reaction
Question 11
A sample of an ideal gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.50 L
B. 1.00 L
C. 2.00 L
D. 4.00 L
Question 12
The solubility of a gas in water is given by the equation: S = kP^\( 1/2 \). If the solubility of a gas at 1 atm is 0.1 M, what is the solubility at 4 atm?
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 13
The atomic number of an element is equal to the number of protons in its atomic nucleus. What is the atomic number of the element with atomic symbol 'Ag'?
A. 45
B. 47
C. 48
D. 49
Question 14
What is the molar solubility of AgCl in 1 L of water?
A. 1.2 x 10^-5 M
B. 1.2 x 10^-6 M
C. 1.2 x 10^-7 M
D. 1.2 x 10^-8 M
Question 15
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
B. g/mol
C. mol/L
D. g/cm^3

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