The formula of carbonate of a metal M is M2CO3.
(a) What will be the formula of its iodide?
(b) What will be the formula of its nitride?
(c) What will be the formula of its phosphate?
According to formula M2CO3, the metal M is univalent having valency of +1 and valency of carbonate is -2 i.e. bivalent.
(a) Iodine is univalent as valency of iodine is -1, hence formula of iodide = MI
(b) Nitrogen is trivalent as valency of nitrogen is -3, hence formula of nitride = M3N
(c) Phosphorus is trivalent as valency of phosphorus is -3, hence formula of phosphate = M3PO4