POST UTME UNILORIN 2018 Chemistry | Objective

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Question 1
A 100.0 mL sample of a solution containing 0.100 M Cu2+ ions is titrated with 0.100 M Na2S. Calculate the number of moles of Cu2+ ions present in the original solution.
A. 0.0100 mol
B. 0.0150 mol
C. 0.0200 mol
D. 0.0250 mol
Question 2
Determine the structure of the compound formed by the reaction between 2-methylpropane and chlorine gas, given that the reaction is carried out in the presence of light.
A. \( CH_3CH_2CH_2CH_2Cl \)
B. \( CH_3CH_2CH_2CH_2CH_2Cl \)
C. \( CH_3CH_2CH_2CH_2CH_2CH_2Cl \)
D. \( CH_3CH_2CH_2CH_2CH_2CH_2CH_2Cl \)
Question 3
A solution of $HCl$ in water is prepared by dissolving $20,g$ of $HCl$ in $100,mL$ of water. Calculate the molar concentration of the solution.
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 5.0 M
Question 4
A gas at $27^circ C$ and $1.0,atm$ is compressed to $2.0,atm$. Calculate the final volume of the gas, given that the initial volume is $10,L$.
A. 5.0 L
B. 10 L
C. 20 L
D. 40 L
Question 5
A 50.0 g sample of a metal oxide is heated in a crucible until it is completely reduced to the metal. If the mass of the metal produced is 35.0 g, calculate the percentage yield of the reaction.
A. 70%
B. 75%
C. 80%
D. 85%
Question 6
The half-life of a radioactive subs\tance is $10,years$. If the initial amount of the subs\tance is $100,g$, how much of the subs\tance will remain after $20,years$?
A. 20 g
B. 40 g
C. 50 g
D. 60 g
Question 7
A 5.0 g sample of a subs\tance is found to have a mass of 2.5 g when dried. Calculate the percentage of water in the subs\tance.
A. 20%
B. 30%
C. 40%
D. 50%
Question 8
A 10.0 mL sample of a solution containing 0.1 M NaCl is titrated with 0.1 M AgNO3. Calculate the number of moles of NaCl present in the sample.
A. 0.001 moles
B. 0.01 moles
C. 0.1 moles
D. 1 mole
Question 9
A 1.0 M solution of potassium permanganate is titrated with a 1.0 M solution of oxalic acid. Calculate the number of moles of oxalic acid required to react with 50 mL of the potassium permanganate solution.
A. ( 0.05 ) mol
B. ( 0.10 ) mol
C. ( 0.15 ) mol
D. ( 0.20 ) mol
Question 10
A gas at $27^circ C$ and $1.0,atm$ is expanded to $0.5,atm$. Calculate the final volume of the gas, given that the initial volume is $10,L$.
A. 5.0 L
B. 10 L
C. 20 L
D. 40 L
Question 11
A solution containing 0.5 M H2SO4 is mixed with a solution containing 0.5 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 7
D. 14
Question 12
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 13
A 50.0 g sample of a metal hydroxide is dissolved in water to form a solution containing 0.100 M OH- ions. Calculate the concentration of the metal ions in the solution.
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 14
A 2.0 L sample of a gas at 25°C and 1 atm is collected over water. Calculate the partial pressure of the gas.
A. 0.5 atm
B. 1 atm
C. 1.5 atm
D. 2 atm
Question 15
A 0.1 M solution of sodium hydroxide is mixed with a 0.1 M solution of hydrochloric acid. Calculate the concentration of the resulting solution.
A. ( 0.1 ) M
B. ( 0.2 ) M
C. ( 0.3 ) M
D. ( 0.4 ) M

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