CBSE 2026 · Region 5 · Set 3 · Q18 · 2 marks
(a)Name the cell used in hearing aids and watches.(b)Define conductivity. Why is direct current (DC) not used for the measurement of resistance of an ionic solution? []
(a)
Name the cell used in hearing aids and watches.
(b)
Define conductivity. Why is direct current (DC) not used for the measurement of resistance of an ionic solution? []
Marking-scheme solution
(a)
Mercury cell /Button cell
(b)
The conductivity of a solution at any given concentration is the conductance of one
unit volume of solution kept between two platinum electrodes with unit area of cross
DC changes the composition of the solution.
ElectrochemistryBatteriesRemembervery_short_answereasy
More from Electrochemistry
- Kohlrausch gave the following relation for strong electrolytes: Λ m=Λ m^°-A √C Which of the following…2025 · asked 4×
- (i) What should be the signs (positive/negative) for E^° Cell and Δ G^° for a spontaneous redox reaction…2023 · asked 3×
- Batteries and fuel cells are very useful forms of galvanic cell. Any battery or cell that we use as a source…2024 · asked 3×
- (i) Calculate emf of the following cell at 25°C: Zn( s) Zn^2+(0 · 001 M) Cd^2+(0 · 1 M) Cd( s) Given: E Zn^2+…2024 · asked 3×
- In a galvanic cell, chemical energy of a redox reaction is converted into electrical energy, whereas in an…2024 · asked 3×
- (i) For a galvanic cell, the following half reactions are given. Decide, which will remain as reduction…2025 · asked 3×
- Write the cell reaction and calculate the e.m.f. of the following cell at 298 K: ( 3 + 2 = 5 ) Sn(s)…2025 · asked 3×
- Four half reactions I to IV are shown below: I. 2 Cl l^- → Cl 2+2 e^- II. 4 OH^- → O 2+2 H 2 O+2 e^- III.…2023 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.