MHT CET202019 Oct 2020Morning ShiftChemistryElectrochemistryActual
Which among the following is an example of metal-sparingly soluble salt electrode?
Options
- AOH ⁻ (aq.) O _ 2( ~g ) , Pt
- BCl ⁻ (aq.) | AgCl _ ( s ) | Ag _ ( s )
- CZn ²⁺ (aq.) Zn ( s )
- DCu ⁺ (aq.), Cu ²⁺ (aq.) Pt
Correct answer
B. Cl ⁻ (aq.) | AgCl _ ( s ) | Ag _ ( s )
Step-by-step solution
Ag/AgCl is a second type electrode in which the metal is in contact wit its low soluble salt and the anion of that salt. In your case, the metal is Ag in contact with its low soluble salt AgCl + its anion Cl(-) and the reaction is AgCl + e = Ag + Cl(-). This reaction is the half cell of Ag/AgCl ref. electrode.