Download App

Electrochemistry — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
How would you determine the standard electrode potential of the system Mg2+|Mg?
✓

Answer

The standard electrode potential of Mg2+ | Mg can be measured with respect to the standard hydrogen electrode, represented by Pt(s), H2(g) (1atm) | H+(aq) (1M).
A cell, consisting of Mg | MgSO4 (aq 1M) as the anode and the standard hydrogen electrode as the cathode, is set up.
$\text{Mg}|\text{Mg}^{2+}(\text{aq, 1M})||\text{H}^+(\text{aq, 1M})|\text{H}_2(\text{g, 1 bar}),\text{Pt}_{(s)}$
Then, the emf of the cell is measured and this measured emf is the standard electrode potential of the magnesium electrode.
$\text{E}^\ominus=\text{E}^\ominus_\text{R}-\text{E}^\ominus_\text{L}$
Here, $\text{E}^\ominus_\text{R}$ for the standard hydrogen electrode is zero.
$\therefore\ \text{E}^\ominus=0-\text{E}^\ominus_\text{L}$
$=-\text{E}^\ominus_\text{L}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Short Answer Type Questions [2M]" from Electrochemistry→Electrochemistry — all question types→Chemistry STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

18g of glucose, C6H12O6 (Molar Mass=180g mol-1) is dissolved in 1kg of water in a sauce pan. At what temperature will this solution boil?
(Kb  for water = 0.52 K kg mol-1, boiling point of pure water = 373.15 K).
→
Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C.
→
What are constituent units of cellulose?
→
Give the structure of A, B and C in the following reaction:

$\text{CH}_3\text{CH}_2\text{I}\xrightarrow[]{\text{NaCN}}\text{A}\xrightarrow[\text{Partial hydolysis}]{\text{OH}^+}\text{B}\xrightarrow[]{\text{NaOH}+\text{Br}_2}\text{C}$

→
Using the standard electrode potentials given in Table 3.1, predict if the reaction between the following is feasible:
Fe3+(aq) and I– (aq)
→
Give examples and suggest reasons for the following features of the transition metal chemistry
The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
→
The rate of a reaction becomes four times when the temperature changes from 293 K to 313K. Calculate the energy of activation (Ea) of the reaction assuming that it does not change with temperature.
[R=8.314 J K-1 MOL-1, log 4=0.6021]
→
Write the name and structure of monomer in Nylon 6.
→
Faraday's first law of electrolysis.
→
Why do gases always tend to be less soluble in liquids as the temperature is raised?
→