Sodium looses its lustre on exposure to air due to formation of-
(A) Na2O, NaOH and Na2CO3
(B) Na2O and NaOH
(C) Na2O and Na2CO3
(D) NaOH and Na2CO3
(A). In air, a layer of Na2O, NaOH and Na2CO3 is formed on its surface which loses its lustre.