POST UTME ESUT 2017 Chemistry | Objective

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Question 1
The rate cons\tant (k) of a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 300 K, calculate the value of k if A = 2.5 x 10^10 s^-1.
A. 1.5 x 10^6 s^-1
B. 2.5 x 10^6 s^-1
C. 3.5 x 10^6 s^-1
D. 4.5 x 10^6 s^-1
Question 2
The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance initially exists, how much will remain after 10 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 3
In the electrolysis of water, what is the primary product at the cathode?
A. Hydrogen gas
B. Oxygen gas
C. Water
D. Hydrogen peroxide
Question 4
A mixture of 2.0 g of an unknown metal oxide and 10.0 g of CO in a 100 mL flask is heated to 1000 K. If the reaction is 100% efficient, what is the maximum mass of the metal that can be produced?
A. 2.5 g
B. 5.0 g
C. 10.0 g
D. 15.0 g
Question 5
A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 6
Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.050 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 7
What is the major difference between a true solution and a colloidal solution?
A. Particle size
B. Intermolecular forces
C. Solubility
D. Vis\cosity
Question 8
A solution contains 0.5 M HCl. If 20 mL of this solution is titrated with 0.1 M NaOH, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A sample of a metal (M) reacts with oxygen to form a metal oxide (MO). The reaction is as follows: 4M + 3O2 → 2MO. If 2.0 g of M reacts with 3.0 g of O2, what is the mass of MO produced?
A. 2.5 g
B. 5.0 g
C. 7.5 g
D. 10.0 g
Question 10
What is the major difference between a primary and a secondary alkyl halide?
A. Primary alkyl halides have a tertiary carbon atom
B. Secondary alkyl halides have a secondary carbon atom
C. Primary alkyl halides have a primary carbon atom
D. Secondary alkyl halides have a primary carbon atom
Question 11
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 12
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 13
A sample of a metal (M) reacts with oxygen to form a metal oxide (MO). The reaction is as follows: 4M + 3O2 → 2MO. If 2.0 g of M reacts with 3.0 g of O2, what is the mass of M that can be produced from 10.0 g of O2?
A. 2.5 g
B. 5.0 g
C. 7.5 g
D. 10.0 g
Question 14
What is the major product of the reaction between ethene and hydrogen in the presence of a palladium catalyst?
A. Ethane
B. Ethanol
C. Propane
D. Bu\tane
Question 15
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L

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