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POST UTME LAUTECH 2024 Chemistry | Objective

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Question 1

A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?

A. 360 g/mol

B. 420 g/mol

Correct C. 480 g/mol

D. 540 g/mol

Correct Answer: C

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Question 2

A 2.0 L flask contains 0.50 mol of an ideal gas at a temperature of 300 K. If the gas is heated to 400 K, what is the new volume of the gas?

A. 2.5 L

Correct B. 3.0 L

C. 3.5 L

D. 4.0 L

Correct Answer: B

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Question 3

A solution of 0.10 M NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?

Correct A. 10 g/L

B. 20 g/L

C. 30 g/L

D. 40 g/L

Correct Answer: A

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Question 4

A 50 mL sample of a 0.20 M solution of HCl is titrated with 0.10 M NaOH. What is the pH of the solution after the titration?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 5

A 1.0 L flask contains 0.50 mol of an ideal gas at a temperature of 300 K. If the gas is compressed to 0.50 L, what is the new temperature of the gas?

A. 600 K

B. 700 K

Correct C. 800 K

D. 900 K

Correct Answer: C

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Question 6

A solution of $NH_4Cl$ in water is prepared by dissolving $10.0,g$ of $NH_4Cl$ in $100,mL$ of water. Calculate the molarity 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 7

A metal M has a density of $7.9,g/cm^3$. If $2.5,g$ of the metal occupies a volume of $0.5,cm^3$, what is the percentage of the metal that is made up of the element with atomic number 13?

Correct A. 25%

B. 50%

C. 75%

D. 90%

Correct Answer: A

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Question 8

A sample of $CO_2$ gas occupies a volume of $2.5,L$ at a pressure of $1.5,atm$. If the temperature is increased to $50^\circ C$, what is the new volume of the gas?

A. 3.5 L

B. 4.0 L

Correct C. 4.5 L

D. 5.0 L

Correct Answer: C

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Question 9

A solution of $HCl$ in water is prepared by dissolving $10.0,g$ of $HCl$ in $100,mL$ of water. If the molarity of the solution is $1.5,M$, what is the concentration of the solution in terms of molality?

Correct A. 1.5 m

B. 2.0 m

C. 3.0 m

D. 4.0 m

Correct Answer: A

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Question 10

A metal M has a density of $8.5,g/cm^3$. If $3.0,g$ of the metal occupies a volume of $0.2,cm^3$, what is the percentage of the metal that is made up of the element with atomic number 11?

A. 30%

Correct B. 50%

C. 70%

D. 90%

Correct Answer: B

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Question 11

The s\tandard enthalpy of formation of CO2 (g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C2H6 (g) if the s\tandard enthalpy of formation of CO (g) is -110.5 kJ/mol and the s\tandard enthalpy of formation of H2O (l) is -285.8 kJ/mol.

A. -83.8 kJ/mol

Correct B. -84.8 kJ/mol

C. -85.8 kJ/mol

D. -86.8 kJ/mol

Correct Answer: B

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Question 12

A 2.5 M solution of HCl (aq) is mixed with a 2.5 M solution of NaOH (aq) in a 1:1 ratio. What is the concentration of the resulting solution?

A. 2.5 M

Correct B. 5.0 M

C. 10.0 M

D. 12.5 M

Correct Answer: B

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Question 13

The s\tandard enthalpy of combustion of C6H12O6 (s) is -2802 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 g of C6H12O6 (s).

Correct A. -4203 kJ

B. -4204 kJ

C. -4205 kJ

D. -4206 kJ

Correct Answer: A

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Question 14

A 0.5 M solution of H2SO4 (aq) is mixed with a 0.5 M solution of NaOH (aq) in a 1:1 ratio. What is the concentration of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 15

The s\tandard enthalpy of formation of CO (g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C2H6 (g) if the s\tandard enthalpy of formation of H2O (l) is -285.8 kJ/mol.

A. -83.8 kJ/mol

Correct B. -84.8 kJ/mol

C. -85.8 kJ/mol

D. -86.8 kJ/mol

Correct Answer: B

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Question 16

Determine the major product of the reaction between 2-methylpropene and HCl.

Correct A. 2-chloro-2-methylpropane

B. 2-chloro-2-methylbu\tane

C. 2-chloro-3-methylbu\tane

D. 2-chloro-2-methylpen\tane

Correct Answer: A

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Question 17

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 15.0 mL of NaOH.

A. 2.00

B. 2.50

Correct C. 3.00

D. 3.50

Correct Answer: C

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Question 18

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).

A. -2800 kJ

B. -2900 kJ

Correct C. -3000 kJ

D. -3100 kJ

Correct Answer: C

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Question 19

A 2.00 L flask contains 0.100 mol of N2(g) at 25.0°C. Calculate the pressure of the gas.

A. 0.100 atm

B. 0.500 atm

Correct C. 1.00 atm

D. 2.00 atm

Correct Answer: C

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Question 20

A solution contains 0.100 M HCl and 0.100 M NaOH. Calculate the pH of the solution.

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 21

A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the polymer is 50,000 g/mol and the molecular weight of the diol is 100 g/mol, what is the molecular weight of the diacid?

A. 200 g/mol

Correct B. 500 g/mol

C. 1000 g/mol

D. 2000 g/mol

Correct Answer: B

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Question 22

A solution of sulfuric acid (H2SO4) is 0.5 M. What is the concentration of hydrogen ions $ H+ $ in the solution?

A. 0.1 M

Correct B. 0.25 M

C. 0.5 M

D. 1 M

Correct Answer: B

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Question 23

A hydrocarbon has the molecular formula C5H12. What is the type of hydrocarbon?

Correct A. Alkane

B. Alkene

C. Alkyne

D. Aromatic

Correct Answer: A

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Question 24

A solution of sodium hydroxide (NaOH) is 0.2 M. What is the concentration of hydroxide ions $ OH- $ in the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.5 M

D. 1 M

Correct Answer: B

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Question 25

A sample of a non-metal has a mass of 2.5 g and a volume of 5 mL. What is the density of the non-metal?

A. 0.1 g/mL

Correct B. 0.5 g/mL

C. 1 g/mL

D. 2 g/mL

Correct Answer: B

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