खालीलपैकी कोणते अल्कधर्मी नाही? A. सोडियम B. पोटॅशियम C. लिथियम D. सल्फर

Sodium, potassium and lithium are alkali metals (Group 1); they form strongly alkaline hydroxides such as NaOH and KOH. Sulphur is a non-metal whose oxides form acids (such as H₂SO₄), so it is not alkaline.