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POST UTME UNN 2017 Chemistry | Objective

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Question 1

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

A. 7

Correct B. 2

C. 10

D. 14

Correct Answer: B

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M NaOH is added to 25.0 mL of 0.1 M HCl, what is the pH of the resulting solution?

A. 7

Correct B. 2

C. 10

D. 14

Correct Answer: B

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Question 3

The rate cons\tant (k) for a first-order reaction is given by the equation \( k = Ae^{-E_a/RT} \). If the activation energy \( E_a \) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 298 K, what is the value of A?

Correct A. 1.0 x 10^10

B. 1.0 x 10^5

C. 1.0 x 10^2

D. 1.0 x 10^-5

Correct Answer: A

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Question 4

A diagram of a chemical apparatus is shown below. If the apparatus is used to measure the volume of a gas, what is the name of the apparatus?

Correct A. Burette

B. Test Tube

C. Beaker

D. Flask

Correct Answer: A

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Question 5

The half-life \( t_1/2 \) of a radioactive subs\tance is given by the equation \( t_{1/2} = \frac{ln 2}{k} \). If the decay cons\tant (k) is 0.05 min^-1, what is the half-life of the subs\tance?

A. 14 min

Correct B. 28 min

C. 42 min

D. 56 min

Correct Answer: B

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Question 6

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is present initially, how much of the subs\tance will remain after 15 days?

Correct A. 12.5 mg

B. 25 mg

C. 50 mg

D. 100 mg

Correct Answer: A

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Question 7

A solution of 2 M HCl is titrated with 1 M NaOH. If 25 mL of NaOH is added, what is the pH of the resulting solution?

A. 2

Correct B. 3

C. 4

D. 5

Correct Answer: B

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Question 8

A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in water and diluting to 1 L. What is the molarity of the resulting solution?

Correct A. 0.1 M

B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: A

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Question 9

A 1 L solution of 0.5 M HCl is prepared by dissolving 250 g of HCl in water. What is the mass of HCl in the solution?

A. 125 g

Correct B. 250 g

C. 375 g

D. 500 g

Correct Answer: B

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Question 10

A 2 L solution of 0.2 M NaOH is prepared by dissolving 40 g of NaOH in water. What is the molarity 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

Determine the number of moles of nitrogen gas (N2) produced in the reaction: 2NH3(g) + 3O2(g) → 2N2(g) + 6H2O(l) when 2.5 moles of ammonia (NH3) are consumed.

Correct A. 1.25 moles

B. 2.5 moles

C. 3.75 moles

D. 5 moles

Correct Answer: A

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Question 12

A 0.500 M solution of sodium hydroxide (NaOH) is mixed with 0.500 M solution of hydrochloric acid (HCl). What is the resulting pH of the solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 13

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M sodium hydroxide (NaOH) is used to titrate 25.0 mL of 0.100 M hydrochloric acid (HCl), what is the resulting pH of the solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 14

A 0.500 M solution of sodium hydroxide (NaOH) is mixed with 0.500 M solution of hydrochloric acid (HCl). What is the resulting concentration of sodium chloride (NaCl) in the solution?

A. 0.500 M

B. 0.750 M

Correct C. 1.000 M

D. 1.250 M

Correct Answer: C

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Question 15

A diagram of a chemical apparatus is shown below. If 25.0 mL of 0.100 M sodium hydroxide (NaOH) is used to titrate 25.0 mL of 0.100 M hydrochloric acid (HCl), what is the resulting concentration of sodium chloride (NaCl) in the solution?

A. 0.500 M

B. 0.750 M

Correct C. 1.000 M

D. 1.250 M

Correct Answer: C

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Question 16

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

A. 117.2 kJ/mol

Correct B. -117.2 kJ/mol

C. 117.2 kJ/mol

D. -393.5 kJ/mol

Correct Answer: B

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Question 17

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of H2(g)?

Correct A. 0 kJ/mol

B. 285.8 kJ/mol

C. -285.8 kJ/mol

D. 117.2 kJ/mol

Correct Answer: A

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Question 18

The s\tandard enthalpy of formation of CH4(g) is -74.8 kJ/mol. What is the s\tandard enthalpy of formation of C(s)?

Correct A. 0 kJ/mol

B. 74.8 kJ/mol

C. -74.8 kJ/mol

D. 117.2 kJ/mol

Correct Answer: A

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Question 19

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of O2(g)?

Correct A. 0 kJ/mol

B. 393.5 kJ/mol

C. -393.5 kJ/mol

D. 117.2 kJ/mol

Correct Answer: A

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Question 20

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of H(g)?

Correct A. 0 kJ/mol

B. 285.8 kJ/mol

C. -285.8 kJ/mol

D. 117.2 kJ/mol

Correct Answer: A

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Question 21

A sample of a gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure. What is the new volume of the gas, given that the initial volume is 2.5 L?

A. 6.5 L

B. 8.5 L

Correct C. 10.5 L

D. 12.5 L

Correct Answer: C

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Question 22

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl used?

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 23

A sample of N2 gas at 25°C and 1 atm is compressed to 5 atm at cons\tant temperature. What is the new volume of the gas?

A. 0.2 L

B. 0.5 L

Correct C. 1.0 L

D. 2.0 L

Correct Answer: C

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Question 24

A 0.05 M solution of H2SO4 is titrated with 0.05 M NaOH. If 50 mL of NaOH is required to reach the equivalence point, what is the volume of H2SO4 used?

A. 50 mL

B. 75 mL

Correct C. 100 mL

D. 125 mL

Correct Answer: C

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Question 25

A sample of O2 gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure. What is the new volume of the gas, given that the initial volume is 2.5 L?

A. 6.5 L

B. 8.5 L

Correct C. 10.5 L

D. 12.5 L

Correct Answer: C

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