An chemistry student prototypes a simple chemical cell to study the conditions required to generate a measurable potential difference, using the experimental setup shown below.
Which of the following combinations of Electrode 1, Electrode 2, and Liquid Medium will produce a non-zero voltage reading on the digital voltmeter?
Electrode 1: Iron; Electrode 2: Iron; Liquid Medium: 0.1 mol dm−30.1\text{ mol dm}^{-3}0.1 mol dm−3 aqueous sodium chloride
Electrode 1: Zinc; Electrode 2: Silver; Liquid Medium: 0.5 mol dm−30.5\text{ mol dm}^{-3}0.5 mol dm−3 aqueous potassium sulfate
Electrode 1: Magnesium; Electrode 2: Copper; Liquid Medium: Dry liquid hexane
Electrode 1: Nickel; Electrode 2: Zinc; Liquid Medium: 1.0 mol dm−31.0\text{ mol dm}^{-3}1.0 mol dm−3 aqueous sucrose