Ca + O → A––
Ca + N2 → B––. A & B are
CaO, Ca3 N2
CaO2, Ca3N2
CaO, CaN2
CaO, CaN3
Ca + O → CaO
6Ca + 2N2 → 2Ca3N2
The valency of Ca in Ca3(PO4)2 is :
(CH3COO)2Pb+Ca(OH)2→A+(CH3COO)2Ca
A+CaOCl2→B+CaCl2+H2O Identify A and B.