POST UTME DELSU 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the molarity of a solution that contains 20 g of glu\cose in 1 L of water?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 2
A diagram of a galvanic cell is shown below. What is the s\tandard cell potential for the reaction $\text{Zn}(s)+\text{Cu}^{2+}\( aq)\rightarrow\text{Zn}^{2+}\( aq \ \)+\text{Cu}(s)$?
A. +1.10 V
B. +1.20 V
C. +1.30 V
D. +1.40 V
Question 3
A solution containing 10g of glu\cose (C6H12O6) in 100g of water has a boiling point elevation of 0.5°C. What is the molar mass of glu\cose?
A. 180 g/mol
B. 200 g/mol
C. 220 g/mol
D. 240 g/mol
Question 4
A sample of a gas has a volume of 2 L at 25°C and 1 atm. Calculate the volume of the gas at 50°C and 2 atm.
A. 4
B. 6
C. 8
D. 10
Question 5
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 6
The diagram below shows a titration setup. What is the purpose of the burette?
A. to measure the volume of the titrant
B. to measure the volume of the analyte
C. to mix the titrant and analyte
D. to measure the pH of the solution
Question 7
A sample of 2.5 g of a compound containing only carbon and hydrogen is analyzed by combustion. The amount of carbon dioxide produced is 1.8 g. What is the empirical formula of the compound?
A. CH
B. C2H2
C. C3H4
D. C4H6
Question 8
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 9
What is the concentration of a solution that contains 25 g of NaCl in 250 mL of water?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
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 11
The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 10 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 12
A $0.500\text{ M}$ solution of $\text{CaCl}_2$ is mixed with a $0.500\text{ M}$ solution of $\text{NaOH}$. What is the resulting solution?
A. $\text{Ca(OH)}_2$
B. $\text{CaCl}_2$
C. $\text{NaCl}$
D. $\text{CaCl}_2$ and $\text{NaCl}$
Question 13
The rate cons\tant for a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.
A. 10
B. 20
C. 30
D. 40
Question 14
What is the pH of a solution that is 0.01 M in HNO3?
A. 1
B. 2
C. 3
D. 4
Question 15
A 2 M solution of potassium permanganate is reduced to manganese dioxide. What is the volume of the solution after reduction?
A. 10 L
B. 100 L
C. 1000 L
D. 10000 L

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