Read the Assertion and Reason below and choose the correct option. — Solid State Chemistry Question

💡 Solution & Explanation

Superconductors exhibit exactly zero electrical resistance when cooled below a critical temperature (Assertion is true). They also exhibit perfect diamagnetism via the Meissner effect, expelling all magnetic fields (Reason is true). However, their diamagnetic nature is an independent property of the superconducting state and does not explain why their electrical resistance drops to zero. Therefore, correct answer is B.