Among the given statements about electronic conductance, the correct statements are
(A) The electronic conductance depends on the nature and structure of the metal
(B) The electronic conductance depends on temperature (it decreases with increase in temperature)
(C) The composition of the metallic conductor remains unchanged during electronic conductance.
(D) The electronic conduction depends on the number of valence electrons per atom.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (B), (C) and (D)
Electronic (metallic) conductance is the flow of electricity through a metal by the movement of electrons; no ions move and no chemical change takes place. All four statements describe it correctly.
(A) The electronic conductance depends on the nature and structure of the metal — Correct. Different metals, with different crystal structures, have different numbers of mobile electrons and conduct to different extents.
(B) The electronic conductance depends on temperature (it decreases with increase in temperature) — Correct. On heating, the vibrations of the metal ions increase and scatter the moving electrons more, so the conductance falls.
(C) The composition of the metallic conductor remains unchanged during electronic conductance. — Correct. Electrons enter at one end and leave at the other, so the metal is not changed; in electrolytic conductance, by contrast, ions move and chemical changes occur at the electrodes.
(D) The electronic conduction depends on the number of valence electrons per atom. — Correct. The valence electrons are the ones that become mobile, so more valence electrons per atom generally mean more charge carriers.
NCERT (2026-27 edition):
Conductance of Electrolytic Solutions – …
