Which of the following is a diamagnetic substance?

The correct answer is Option (1) → copper

NCERT (2026-27):
Diamagnetism – “Some diamagnetic materials are bismuth, copper, lead, silicon, nitrogen (at STP), water and sodium chloride. Diamagnetism is present in all the substances. However, the effect is so weak in most cases that it gets shifted by other effects like paramagnetism, ferromagnetism, etc.”