Exam-style practice (harder): Chemistry multiple choice quiz
14 questions. Pick an answer and you'll see why right away. Options are shuffled each attempt, and the review at the end links each missed question to the dot point to revise.
What is the pH of a 0.0050 mol L⁻¹ solution of barium hydroxide, Ba(OH)₂, at 25 °C?
A 0.10 mol L⁻¹ solution of a weak monoprotic acid, HA, has a pH of 3.0 at 25 °C.
What is the acid dissociation constant, Ka, of HA?
At 50 °C, the ionisation constant of water is Kw = 5.5 x 10⁻¹⁴.
Which statement about pure water at 50 °C is correct?
0.10 mol L⁻¹ NaOH is added gradually to 25 mL of 0.10 mol L⁻¹ HCl, and the electrical conductivity of the mixture is measured. The conductivity falls steadily to a minimum at 25 mL of NaOH, then rises.
Which statement best explains this pattern?
For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), Kc = 0.50 at a particular temperature. At one moment, a reaction vessel at this temperature contains [N₂] = 0.50 mol L⁻¹, [H₂] = 1.0 mol L⁻¹ and [NH₃] = 2.0 mol L⁻¹.
Which statement is correct?
Consider the reaction:
2MnO₄⁻(aq) + 5SO₃²⁻(aq) + 6H⁺(aq) → 2Mn²⁺(aq) + 5SO₄²⁻(aq) + 3H₂O(l)
Which statement is correct?
Silver is electroplated from a silver nitrate solution. What current is needed to deposit 2.16 g of silver in 10.0 minutes? (M(Ag) = 107.9 g mol⁻¹, F = 96 485 C mol⁻¹)
Half-equation E° (V) Mg²⁺(aq) + 2e⁻ ⇌ Mg(s) -2.37 Zn²⁺(aq) + 2e⁻ ⇌ Zn(s) -0.76 Fe²⁺(aq) + 2e⁻ ⇌ Fe(s) -0.44 Sn²⁺(aq) + 2e⁻ ⇌ Sn(s) -0.14 Cu²⁺(aq) + 2e⁻ ⇌ Cu(s) +0.34 A steel (iron) pipe is to be protected from corrosion with a sacrificial anode connected to it. Which choice and reason is correct?
What is the IUPAC name of the compound CH₃CH(CH₃)CH₂CH(OH)CH₃?
Which of these alcohols can exist as a pair of optical isomers (enantiomers)?
An unknown liquid has a mass spectrum with a molecular ion peak at m/z 46 and its largest (base) peak at m/z 31. Its infrared spectrum shows a broad absorption from 3200 to 3550 cm⁻¹ and no strong absorption near 1700 cm⁻¹.
Which compound is it?
12.0 g of ethanoic acid (M = 60.0 g mol⁻¹) is heated with excess ethanol and a sulfuric acid catalyst. 12.3 g of ethyl ethanoate (M = 88.0 g mol⁻¹) is collected.
What is the percentage yield?
An egg white is heated until it turns white and solid. The protein albumin has been denatured.
Which statement best describes what has happened to the protein?
An antacid tablet containing calcium carbonate is dissolved in 50.0 mL of 0.500 mol L⁻¹ HCl, which is in excess. The excess HCl is titrated with 18.0 mL of 0.400 mol L⁻¹ NaOH.
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g)
What mass of calcium carbonate (M = 100.1 g mol⁻¹) was in the tablet?