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?

Academic Chemistry NCERT Class 9

To find out the valency of the metal M (carbonate ion has a valency of −2):

Element/Ion M CO₃²⁻

Valency 1 2

Hence, M has a valency of 1.

(a) Formula of iodide of M:

Element M I

Valency 1 1

Hence, on crossing the valencies, the formula of the iodide of M is MI.

(b) Formula of nitride of M:

Element/Ion M N³⁻

Valency 1 −3

Hence, on crossing the valencies, the formula of the nitride of M is M₃N.

(c) Formula of phosphate of M:

Element/Ion M PO₄³⁻

Valency 1 −3

Hence, on crossing the valencies, the formula of the phosphate of M is M₃PO₄.

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Updated on: 10-Oct-2022

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