| 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 |