Question

Which one of the following is the structure of hexa Meta phosphate? X represents monovalent alkali metal.

(a) X5P3O10

(b) (XPO3)6

(c) PO4^-3

(d) X4P2O7∙YH2 O

The question was posed to me in an international level competition.

My doubt stems from Inorganic Chemical topic in portion Inorganic Chemical Industries of Chemical Technology

Answer 1

Correct choice is (b) (XPO3)6

To explain: The structure of meta phosphate is PO3^–, on combining X and PO3^– we get XPO3. Hence hexa Meta phosphate structure is (XPO3)6.