POST UTME UNIOSUN 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between hydrogen gas and oxygen gas is represented by the equation: 2H2 + O2 → 2H2O. What is the oxidation state of oxygen in the product H2O?
A. -2
B. -1
C. +1
D. +2
Question 2
The reaction between chlorine gas and potassium iodide is represented by the equation: Cl2 + 2KI → 2KCl + I2. What is the oxidation state of iodine in the product I2?
A. 0
B. -1
C. +1
D. +2
Question 3
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical flask
D. Measuring cylinder
Question 4
A 10.0 g sample of a metal is heated to 100°C. If the specific heat capacity of the metal is 0.5 J/g°C, what is the energy required to heat the metal to 200°C?
A. 250 J
B. 500 J
C. 750 J
D. 1000 J
Question 5
A solution contains 0.1 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A sample of oxygen gas at 25°C and 1 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of oxygen gas?
A. 736.2 mmHg
B. 760 mmHg
C. 23.8 mmHg
D. 0 mmHg
Question 7
A solution contains 5.0 g of NaCl. If 25.0 mL of 0.1 M AgNO3 is added to the solution, what is the concentration of the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 8
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 9
A 1.0 L flask contains 0.5 mol of CO2 at 25°C. What is the partial pressure of CO2?
A. 0.5 × 10^5 Pa
B. 1.0 × 10^5 Pa
C. 1.5 × 10^5 Pa
D. 2.0 × 10^5 Pa
Question 10
The enthalpy change for the reaction 2Na(s) + Cl2(g) → 2NaCl(s) is -723 kJ/mol. What is the s\tandard enthalpy of formation of NaCl(s)?
A. -361.5 kJ/mol
B. -723 kJ/mol
C. 723 kJ/mol
D. 361.5 kJ/mol

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