| 1 |
Which of these concentration terms changes when the temperature of a solution changes? |
Chemistry
Types of solutions and concentration |
Easy |
| 2 |
What is the molarity of a solution made by dissolving 4 g of NaOH in enough water to give 250 mL of solution?… |
Chemistry
Types of solutions and concentration |
Easy |
| 3 |
9 g of glucose (molar mass 180 g mol⁻¹) is dissolved in 500 g of water. What is the molality of the solution? |
Chemistry
Types of solutions and concentration |
Medium |
| 4 |
A solution contains 1 mol of ethanol and 4 mol of water. What is the mole fraction of ethanol? |
Chemistry
Types of solutions and concentration |
Medium |
| 5 |
Hydrogen gas absorbed in palladium metal is an example of which type of solution? |
Chemistry
Types of solutions and concentration |
Hard |
| 6 |
According to Henry's law, what happens to the solubility of a gas in water if its partial pressure is tripled… |
Chemistry
Solubility and Henry’s law |
Easy |
| 7 |
Why does a bottle of soda water fizz when it is opened? |
Chemistry
Solubility and Henry’s law |
Easy |
| 8 |
At a given temperature, four gases have Henry's law constants (in kbar) of 0.4, 1.7, 34 and 76.5. Which gas i… |
Chemistry
Solubility and Henry’s law |
Medium |
| 9 |
Why are the air tanks used by scuba divers diluted with helium? |
Chemistry
Solubility and Henry’s law |
Medium |
| 10 |
The dissolution of a certain solid in water is endothermic. How will its solubility change as the temperature… |
Chemistry
Solubility and Henry’s law |
Hard |
| 11 |
Which pair of liquids forms a nearly ideal solution? |
Chemistry
Vapour pressure and Raoult’s law |
Easy |
| 12 |
Which statement about a solution showing negative deviation from Raoult's law is correct? |
Chemistry
Vapour pressure and Raoult’s law |
Easy |
| 13 |
Liquids A and B form an ideal solution. p_A° = 400 mm Hg and p_B° = 200 mm Hg. What is the total vapour press… |
Chemistry
Vapour pressure and Raoult’s law |
Medium |
| 14 |
For the solution in which p_A° = 400 mm Hg, p_B° = 200 mm Hg and x_A = 0.25, what is the mole fraction of A i… |
Chemistry
Vapour pressure and Raoult’s law |
Hard |
| 15 |
Why can a 95% ethanol–water mixture not be made purer by simple fractional distillation? |
Chemistry
Vapour pressure and Raoult’s law |
Medium |
| 16 |
Which of these is NOT a colligative property? |
Chemistry
Colligative properties |
Easy |
| 17 |
What is the elevation in boiling point of a 0.5 mol kg⁻¹ aqueous solution of urea? (Kb of water = 0.52 K kg m… |
Chemistry
Colligative properties |
Easy |
| 18 |
What is the osmotic pressure of a 0.1 M solution of a non-electrolyte at 300 K? (R = 0.0821 L atm K⁻¹ mol⁻¹) |
Chemistry
Colligative properties |
Medium |
| 19 |
What happens to red blood cells placed in a solution with a salt concentration higher than that of blood plas… |
Chemistry
Colligative properties |
Medium |
| 20 |
In reverse osmosis used to desalinate seawater, what must be true of the pressure applied on the seawater sid… |
Chemistry
Colligative properties |
Hard |
| 21 |
What is the van't Hoff factor of K₂SO₄ assuming complete dissociation in water? |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Easy |
| 22 |
Ethanoic acid forms dimers in benzene. Compared with its true molar mass, the molar mass found from freezing … |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Easy |
| 23 |
What is the depression in freezing point of 0.1 mol kg⁻¹ aqueous NaCl, assuming complete dissociation? (Kf = … |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Medium |
| 24 |
Which 0.1 mol kg⁻¹ aqueous solution has the lowest freezing point? |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Medium |
| 25 |
A salt of type AB₂ dissociates partially in water and its van't Hoff factor is found to be 2.6. What is its d… |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Hard |
| 26 |
In a Daniell cell, which process takes place at the anode? |
Chemistry
Galvanic cells and electrode potential |
Easy |
| 27 |
What is the role of a salt bridge in a galvanic cell? |
Chemistry
Galvanic cells and electrode potential |
Easy |
| 28 |
Given E°(Zn²⁺/Zn) = −0.76 V and E°(Cu²⁺/Cu) = +0.34 V, what is the standard EMF of the Daniell cell? |
Chemistry
Galvanic cells and electrode potential |
Medium |
| 29 |
E°(Ag⁺/Ag) = +0.80 V and E°(Cu²⁺/Cu) = +0.34 V. What happens when a copper strip is dipped into silver nitrat… |
Chemistry
Galvanic cells and electrode potential |
Medium |
| 30 |
Which of these is the strongest reducing agent, given E° values Li⁺/Li = −3.05 V, Na⁺/Na = −2.71 V, Mg²⁺/Mg =… |
Chemistry
Galvanic cells and electrode potential |
Hard |
| 31 |
Which relation correctly links the standard Gibbs energy change with the standard cell EMF? |
Chemistry
Nernst equation |
Easy |
| 32 |
What is the electrode potential of a hydrogen electrode in a solution of pH 1 at 298 K, with H₂ at 1 bar? |
Chemistry
Nernst equation |
Easy |
| 33 |
Calculate ΔG° for the Daniell cell (E°cell = 1.10 V, n = 2, F = 96500 C mol⁻¹). |
Chemistry
Nernst equation |
Medium |
| 34 |
For the cell Zn | Zn²⁺(0.1 M) || Cu²⁺(1 M) | Cu at 298 K, with E°cell = 1.10 V, what is E_cell? |
Chemistry
Nernst equation |
Hard |
| 35 |
A cell reaction involves 2 electrons and has E°cell = 0.2955 V at 298 K. What is its equilibrium constant? |
Chemistry
Nernst equation |
Medium |
| 36 |
How do conductivity (κ) and molar conductivity (Λm) of an electrolyte solution change on dilution? |
Chemistry
Conductance of electrolytic solutions |
Easy |
| 37 |
The resistance of a conductivity cell filled with 0.1 M KCl (κ = 0.0129 S cm⁻¹) is 100 Ω. What is the cell co… |
Chemistry
Conductance of electrolytic solutions |
Medium |
| 38 |
A 0.1 M solution has conductivity 0.012 S cm⁻¹. What is its molar conductivity? |
Chemistry
Conductance of electrolytic solutions |
Easy |
| 39 |
Given Λ°(CH₃COONa) = 91.0, Λ°(HCl) = 426.2 and Λ°(NaCl) = 126.5 S cm² mol⁻¹, what is Λ° for CH₃COOH? |
Chemistry
Conductance of electrolytic solutions |
Medium |
| 40 |
At a certain concentration, acetic acid has Λm = 39.07 S cm² mol⁻¹ and Λ°m = 390.7 S cm² mol⁻¹. What is its d… |
Chemistry
Conductance of electrolytic solutions |
Hard |
| 41 |
Which product forms at the cathode during electrolysis of aqueous sodium chloride with inert electrodes? |
Chemistry
Electrolysis |
Easy |
| 42 |
How many faradays are needed to deposit 1 mol of aluminium from Al³⁺ ions? |
Chemistry
Electrolysis |
Easy |
| 43 |
A current of 2 A is passed through CuSO₄ solution for 965 s. What mass of copper is deposited? (Cu = 63.5 g m… |
Chemistry
Electrolysis |
Medium |
| 44 |
The same quantity of electricity that deposits 0.635 g of copper from Cu²⁺ is passed through AgNO₃ solution. … |
Chemistry
Electrolysis |
Hard |
| 45 |
What happens at the anode when aqueous copper sulphate is electrolysed using copper electrodes? |
Chemistry
Electrolysis |
Medium |
| 46 |
Which of these is a secondary (rechargeable) battery? |
Chemistry
Batteries, fuel cells and corrosion |
Easy |
| 47 |
What is the overall reaction in a hydrogen–oxygen fuel cell? |
Chemistry
Batteries, fuel cells and corrosion |
Easy |
| 48 |
Why does a mercury cell give a nearly constant voltage throughout its life? |
Chemistry
Batteries, fuel cells and corrosion |
Medium |
| 49 |
During discharge of a lead storage battery, what is formed at both electrodes? |
Chemistry
Batteries, fuel cells and corrosion |
Medium |
| 50 |
A scratched galvanised iron sheet still does not rust easily. What is the best explanation? |
Chemistry
Batteries, fuel cells and corrosion |
Hard |