A. 9 and 4
B. 11 and 4
C. 4 and 8
D. 4 and 9
"Fluorosis" disease is caused due to the reaction of ________ with excess of fluoride in the body
Two oxides of nitrogen,NO and NO2 react together at 2530K and form a compound of nitrogen X.X reacts with water to yield another compound of nitrogen Y.The shape of the anion of Y molecule is