POST UTME RSU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.2 M NaCl and 0.1 M CaCl2. What is the concentration of Cl^- ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 2
A 50 mL sample of a solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M NaOH. The pH of the solution after the addition of 20 mL of NaOH is 7. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 3
A sample of a solid has a molar mass of 100 g/mol. What is the density of the solid?
A. 1 g/cm^3
B. 2 g/cm^3
C. 3 g/cm^3
D. 4 g/cm^3
Question 4
The reaction of sulfur dioxide with oxygen in the presence of a catalyst produces sulfur trioxide. What is the balanced equation for this reaction?
A. \text{SO}_2 + \text{O}_2 \rightarrow \text{SO}_3
B. \text{SO}_2 + \frac{1}{2}\text{O}_2 \rightarrow \text{SO}_3
C. \text{SO}_2 + \text{O}_2 \rightarrow \text{SO}_4
D. \text{SO}_2 + \frac{1}{2}\text{O}_2 \rightarrow \text{SO}_4
Question 5
The reaction of sodium chloride with silver nitrate produces a precipitate of silver chloride. What is the balanced equation for this reaction?
A. \text{NaCl} + \text{AgNO}_3 \rightarrow \text{AgCl} + \text{NaNO}_3
B. \text{NaCl} + \text{AgNO}_3 \rightarrow \text{Ag}_2\text{Cl}_2 + \text{NaNO}_3
C. \text{NaCl} + \text{AgNO}_3 \rightarrow \text{AgCl} + \text{Na}_2\text{O}
D. \text{NaCl} + \text{AgNO}_3 \rightarrow \text{AgCl} + \text{Na}_2\text{O}_3
Question 6
The reaction between H2SO4 and NaOH is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 20 g of H2SO4 is added to 100 mL of 1 M NaOH, what is the limiting reac\tant?
A. H2SO4
B. NaOH
C. Both are in excess
D. Neither is in excess
Question 7
A diagram of a titration setup is shown below. If 25 mL of 0.5 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 8
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is CaO(s) + CO2(g) → CaCO3(s).
A. -1782.6 kJ/mol
B. -1782.6 kJ/mol
C. -1782.6 kJ/mol
D. -1782.6 kJ/mol
Question 9
A 1.0 M solution of sodium carbonate (Na2CO3) is mixed with a 2.0 M solution of hydrochloric acid (HCl). If 50 mL of Na2CO3 is added to 100 mL of HCl, what is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 10
A sample of 1.0 g of a metal (M) reacts with 20 mL of 1 M HCl to produce 1.0 g of a gas. The gas is collected over water and has a volume of 10 mL at 25°C and 1 atm. What is the identity of the metal?
A. Zn
B. Fe
C. Cu
D. Ag
Question 11
A diagram of a chromatography setup is shown below. If the retention factor (Rf) is 0.5, what is the polarity of the solvent?
A. Non-polar
B. Polar
C. Amphipathic
D. Hydrophobic
Question 12
The reaction between hydrogen peroxide (H2O2) and potassium iodide (KI) is a first-order reaction. The rate cons\tant (k) is 0.05 min^-1. If the initial concentration of H2O2 is 0.1 M, what is the concentration of H2O2 after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 13
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 14
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2H4(l)?
A. -50.6 kJ/mol
B. -50.6 kJ/mol
C. -50.6 kJ/mol
D. -50.6 kJ/mol
Question 15
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4

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