ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು ಕ್ಷಾರೀಯವಲ್ಲ? A. ಸೋಡಿಯಂ B. ಪೊಟ್ಯಾಸಿಯಂ C. ಲಿಥಿಯಂ D. ಸಲ್ಫರ್

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.