Latest NDA Aptitude Question SOLUTION: Three elements Na, S and O combine to from a compound Na2SO6. What is the valency of S this compound ?
(A) 2+ (B) 4+ (C) 6+ (D) 8+
Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.