POST UTME COAL CITY UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Identify the type of isomerism exhibited by the compound 1,2-dimethylcyclohexane.
A. Geometric isomerism
B. Stereoisomerism
C. Conformational isomerism
D. Structural isomerism
Question 2
A 2.50 g sample of a compound containing only carbon and hydrogen is burned in a combustion calorimeter. The mass of carbon dioxide produced is 3.75 g. Calculate the empirical formula of the compound.
A. CH_2
B. C_2H_4
C. C_3H_6
D. C_4H_8
Question 3
A 1.00 L flask contains 0.200 mol of a gas at 298 K. What is the number of moles of gas that can be added to the flask without changing the pressure?
A. 0.100 mol
B. 0.200 mol
C. 0.300 mol
D. 0.400 mol
Question 4
The element with atomic number 16 is a member of which group in the periodic table?
A. Group 14
B. Group 15
C. Group 16
D. Group 17
Question 5
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the product Cu(s)?
A. 0
B. +1
C. +2
D. -1
Question 6
The reaction of methane with chlorine to form chloromethane is represented by the equation: CH4 + Cl2 → CH3Cl + HCl. If 1 mole of methane is reacted with 1 mole of chlorine, what is the limiting reac\tant?
A. CH4
B. Cl2
C. CH3Cl
D. HCl
Question 7
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains ideal?
A. 44.8 L
B. 55.6 L
C. 66.4 L
D. 77.2 L
Question 8
A 0.1 M solution of hydrochloric acid (HCl) is titrated with a 0.1 M solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl that was initially present?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 9
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the polymer in g/L?
A. 1 g/L
B. 10 g/L
C. 100 g/L
D. 1000 g/L
Question 10
The reaction of nitrogen dioxide with water produces which compound?
A. Nitric acid
B. Nitrous acid
C. Nitrogen trioxide
D. Nitrogen tetroxide
Question 11
A 0.500 L flask contains 0.100 mol of a gas at 298 K. What is the partial pressure of the gas?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 3.00 atm
Question 12
A metal M reacts with oxygen to form a compound MO. The compound has a molar mass of 80.0 g/mol and contains 40.0% oxygen by mass. What is the molar mass of the metal M?
A. 40.0 g/mol
B. 60.0 g/mol
C. 80.0 g/mol
D. 120.0 g/mol
Question 13
Identify the type of reaction that occurs when a solution of sodium hydroxide (NaOH) is added to a solution of hydrochloric acid (HCl).
A. Neutralization reaction
B. Oxidation-reduction reaction
C. Precipitation reaction
D. Combustion reaction
Question 14
A 2.00 L sample of a gas at 25°C and 1.00 atm is compressed to 4.00 L at cons\tant temperature. Calculate the work done on the gas.
A. 1.00 kJ
B. 2.00 kJ
C. 3.00 kJ
D. 4.00 kJ
Question 15
Determine the number of moles of oxygen gas produced when 2.5 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.25 mol
B. 0.50 mol
C. 0.75 mol
D. 1.00 mol

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