POST UTME LEAD CITY UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the number of moles of nitrogen gas (N2) that will react with 2.5 moles of hydrogen gas (H2) according to the equation: N2 + 3H2 → 2NH3.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 2
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 3
A sample of hydrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of hydrogen gas is 0.8 atm, what is the mole \fraction of hydrogen gas in the sample?
A. ( 0.8 )
B. ( 0.9 )
C. ( 0.95 )
D. ( 0.99 )
Question 4
A 10.0 mL sample of a solution containing 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains ideal?
A. 44.8 L
B. 22.4 L
C. 11.2 L
D. 5.6 L
Question 6
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4
Question 7
A sample of sodium chloride (NaCl) is dissolved in water to form a saturated solution. What is the concentration of sodium ions \( Na+ \) in the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 8
A sample of oxygen gas (O2) occupies a volume of 2.5 liters at a pressure of 1 atm and a temperature of 25°C. What is the number of moles of oxygen gas present?
A. 0.1 moles
B. 0.2 moles
C. 0.5 moles
D. 1 mole
Question 9
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 10
A solution contains 0.5 M HCl and 0.2 M NaOH. Determine the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 11
A 1.0 L flask contains 0.5 mol of an ideal gas at 50°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 12
The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant of 0.05 s^-1 at 25°C. What is the rate of reaction when [NO] = 0.1 M and [O2] = 0.05 M?
A. 0.001 M s^-1
B. 0.005 M s^-1
C. 0.01 M s^-1
D. 0.05 M s^-1
Question 13
A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.5 M solution of hydrochloric acid (HCl). Determine the concentration of the resulting solution.
A. 1.5 M
B. 2.0 M
C. 2.5 M
D. 3.0 M
Question 14
A 2.5 g sample of a metal hydroxide is treated with 20 mL of 1.0 M hydrochloric acid. If the reaction is 100% efficient, what is the mass of the metal chloride produced?
A. 2.5 g
B. 5.0 g
C. 7.5 g
D. 10.0 g
Question 15
A 2.5 g sample of a polymer is dissolved in 100 mL of solvent. The osmotic pressure of the solution is 1.2 atm at 25°C. Calculate the molar mass of the polymer.
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol

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