Q1 · medium · AI-verified
The molar conductivity of a strong electrolyte at infinite dilution (Λ°m) can be calculated using Kohlrausch's law. If Λ°m(NaCl) = 126 S cm² mol⁻¹, Λ°m(HCl) = 426 S cm² mol⁻¹, and Λ°m(NaA) = 100 S cm² mol⁻¹, what is Λ°m(HA)?
- 652 S cm² mol⁻¹
- 226 S cm² mol⁻¹
- 400 S cm² mol⁻¹
- 426 S cm² mol⁻¹
Q2 · medium · AI-verified
One Faraday of electricity is equal to which of the following?
- 9650 C/mol
- 1.6 × 10⁻¹⁹ C/mol
- 6.022 × 10²³ C/mol
- 96500 C/mol
Q3 · medium · AI-verified
During the electrolysis of dilute sulphuric acid (H₂SO₄), which gas is evolved at the cathode?
- Hydrogen (H₂)
- Oxygen (O₂)
- Sulphur dioxide (SO₂)
- Hydrogen sulphide (H₂S)
Q4 · medium · AI-verified
What is the oxidation state of chromium in K₂Cr₂O₇?
- +3
- +6
- +7
- +4
Q5 · medium · AI-verified
The standard electrode potential (E°) of Cu²⁺/Cu is +0.34 V and that of Zn²⁺/Zn is −0.76 V. What is the standard EMF of a Daniell cell (Zn–Cu)?
- 0.76 V
- 1.10 V
- 1.34 V
- 0.42 V