POST UTME DELSU 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of nitrogen gas is collected over water at 25°C and 1.0 atm. If the vapor pressure of water at 25°C is 0.031 atm, what is the partial pressure of the nitrogen gas?
A. 0.969 atm
B. 0.975 atm
C. 0.985 atm
D. 0.995 atm
Question 2
Determine the number of moles of $\text{O}_2$ produced at $25^\circ\text{C}$ and $1.00\text{ atm}$ when $2.50\text{ g}$ of $\text{KClO}_3$ is decomposed according to the equation $\text{KClO}_3\( s)\rightarrow\text{KCl}\( s \ \)+\frac{3}{2}\text{O}_2(g)$.
A. 0.125 mol
B. 0.250 mol
C. 0.500 mol
D. 1.00 mol
Question 3
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the sample?
A. 0.95 atm
B. 0.99 atm
C. 1.00 atm
D. 1.05 atm
Question 4
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the number of moles of H2SO4.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 5
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen peroxide (H2O2) decompose according to the equation: 2H2O2(l) → 2H2O(l) + O2(g).
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 6
What is the volume of a solution that contains 40 mL of 0.4 M H2SO4?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 7
A $0.500\text{ M}$ solution of $\text{HCl}$ is mixed with a $0.500\text{ M}$ solution of $\text{NaOH}$. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A 5 M solution of sodium carbonate is titrated with a 1 M solution of hydrochloric acid. If 20 mL of the acid solution is required to reach the equivalence point, what is the number of moles of sodium carbonate used?
A. 0.1 mol
B. 0.2 mol
C. 0.5 mol
D. 1 mol
Question 9
A mixture of 20g of sodium chloride (NaCl) and 30g of calcium chloride (CaCl2) is dissolved in 100g of water. What is the total number of moles of ions produced?
A. 6 moles
B. 8 moles
C. 10 moles
D. 12 moles
Question 10
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the resulting solution?
A. neutral
B. basic
C. acidic
D. salt
Question 11
What is the pH of a solution that is 0.01 M in HNO3?
A. 1
B. 2
C. 3
D. 4
Question 12
A 1.0 L container is filled with 0.50 mol of an unknown gas and 0.25 mol of oxygen gas at 25°C. If the total pressure of the mixture is 1.2 atm, what is the mole \fraction of the unknown gas?
A. 0.25
B. 0.50
C. 0.75
D. 1.0
Question 13
What is the molar mass of sodium chloride (NaCl)?
A. 58.44 g/mol
B. 58.5 g/mol
C. 58.6 g/mol
D. 58.7 g/mol
Question 14
The atomic number of an element is 12. What is the number of protons in the nucleus of an atom of that element?
A. 6
B. 12
C. 18
D. 24
Question 15
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the resulting solution?
A. NaCl(aq)
B. H2O(l)
C. NaOH(aq)
D. HCl(aq)

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