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POST UTME UNILORIN 2018 Chemistry | Objective

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Question 1 View Details

A solution of $NH_4Cl$ in water is prepared by dissolving $10,g$ of $NH_4Cl$ in $100,mL$ of water. Calculate the molar concentration of the solution.

A. 0.1 M

B. 0.2 M

Correct C. 0.5 M

D. 1.0 M

Correct Answer: C

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Question 2 View Details

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

Correct B. 40 g

C. 50 g

D. 60 g

Correct Answer: B

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Question 3 View Details

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

Correct C. 20 L

D. 40 L

Correct Answer: C

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Question 4 View Details

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

Correct B. 1.0 M

C. 2.0 M

D. 5.0 M

Correct Answer: B

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Question 5 View Details

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

Correct B. 10 L

C. 20 L

D. 40 L

Correct Answer: B

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Question 6 View Details

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.

Correct 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 $

Correct Answer: A

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Question 7 View Details

A 0.1 M solution of sodium hydroxide is mixed with a 0.1 M solution of acetic acid. Calculate the pH of the resulting solution.

A. ( 7.0 )

Correct B. ( 7.5 )

C. ( 8.0 )

D. ( 8.5 )

Correct Answer: B

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Question 8 View Details

A sample of polystyrene is subjected to a temperature of 100°C for 30 minutes. Calculate the percentage of crystallinity of the sample.

A. ( 20% )

B. ( 30% )

Correct C. ( 40% )

D. ( 50% )

Correct Answer: C

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Question 9 View Details

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

Correct B. ( 0.10 ) mol

C. ( 0.15 ) mol

D. ( 0.20 ) mol

Correct Answer: B

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Question 10 View Details

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

Correct B. ( 0.2 ) M

C. ( 0.3 ) M

D. ( 0.4 ) M

Correct Answer: B

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Question 11 View Details

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 x 10^-10.

A. 1.0 x 10^-5 M

Correct B. 1.5 x 10^-5 M

C. 2.0 x 10^-5 M

D. 3.0 x 10^-5 M

Correct Answer: B

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Question 12 View Details

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

Correct C. 3.00

D. 3.50

Correct Answer: C

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Question 13 View Details

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%

Correct C. 80%

D. 85%

Correct Answer: C

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Question 14 View Details

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

Correct B. 0.0150 mol

C. 0.0200 mol

D. 0.0250 mol

Correct Answer: B

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Question 15 View Details

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

Correct C. 0.100 M

D. 0.125 M

Correct Answer: C

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Question 16 View Details

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.

Correct A. 1.25 moles

B. 2.5 moles

C. 5 moles

D. 10 moles

Correct Answer: A

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Question 17 View Details

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

Correct C. 0.1 moles

D. 1 mole

Correct Answer: C

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Question 18 View Details

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

Correct B. 2

C. 7

D. 14

Correct Answer: B

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Question 19 View Details

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.

Correct A. 0.5 atm

B. 1 atm

C. 1.5 atm

D. 2 atm

Correct Answer: A

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Question 20 View Details

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%

Correct B. 30%

C. 40%

D. 50%

Correct Answer: B

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