POST UTME BSU 2018 Chemistry | Objective

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Question 1
A 1.0 L flask contains 0.5 atm of N2 and 0.5 atm of O2 at 25°C. Calculate the partial pressure of each gas after the reaction: 2N2(g) + O2(g) → 2NO(g).
A. 0.25 atm N2, 0.25 atm O2
B. 0.5 atm N2, 0 atm O2
C. 0 atm N2, 0.5 atm O2
D. 0 atm N2, 0 atm O2
Question 2
A 10 mL sample of a solution containing 0.1 M H2SO4 (sulfuric acid) is titrated with 0.1 M NaOH (sodium hydroxide). What is the pH of the solution after the titration?
A. 1
B. 2
C. 7
D. 14
Question 3
A solution of NaCl is prepared by dissolving 25 g of NaCl in 100 g of water. What is the concentration of the solution in g/L?
A. 0.25 g/L
B. 0.5 g/L
C. 1.0 g/L
D. 2.0 g/L
Question 4
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 g of carbon at 25°C.
A. -590 kJ
B. -590.5 kJ
C. -591 kJ
D. -591.5 kJ
Question 5
Determine the number of moles of H2O2 (hydrogen peroxide) that can be obtained from 2.5 moles of H2O (water) if the reaction is: 2H2O(l) → H2O2(aq) + 2H+(aq).
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 10.0 mL of NaOH has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 8
A diagram of a titration setup is shown below. Identify the part labeled 'A'.
A. Burette
B. Beaker
C. Conical Flask
D. Erlenmeyer Flask
Question 9
A metal M reacts with oxygen to form a basic oxide MO. The s\tandard enthalpy of formation of MO is -823 kJ/mol. Calculate the s\tandard enthalpy of formation of M.
A. -823 kJ/mol
B. -823 kJ/mol
C. -823 kJ/mol
D. -823 kJ/mol
Question 10
A 2.5 M solution of H2SO4 is titrated with 1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 11
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the reaction is complete?
A. 7
B. 8
C. 9
D. 10
Question 12
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. What is the half-life \( t1/2 \) of the reaction?
A. 13.86 min
B. 14.14 min
C. 14.32 min
D. 14.50 min
Question 13
Determine the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(H2(g)) = -285.8 kJ/mol, ΔHf(N2(g)) = 0 kJ/mol, ΔHf(NH3(g)) = -45.9 kJ/mol. Assume that the reaction is: H2(g) + 1/2N2(g) → NH3(g).
A. -46.0 kJ/mol
B. -45.5 kJ/mol
C. -45.9 kJ/mol
D. -46.5 kJ/mol
Question 14
The reaction between sodium hydroxide (NaOH) and acetic acid (CH3COOH) is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction, including the state of each reac\tant and product.
A. CH3COOH + NaOH → CH3COONa + H2O
B. CH3COOH + NaOH → CH3COONa + H2O(l)
C. CH3COOH + NaOH → CH3COONa + H2O(g)
D. CH3COOH + NaOH → CH3COOH + NaOH
Question 15
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4

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