#### Answer

(a) This formula is not correct because a potassium ion is K+, not P+.
The correct formula for potassium iodide is KI.
(b)This formula is correct.
(c)The chemical formula is incorrect. The symbol for a silver ion is Ag+. The correct formula for the carbonate ion is $CO_{3} ^{2-}.$
Thus, the correct way to write silver carbonate is $Ag_{2}CO_{3}$