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Question
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its iodide ?
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Solution
Let us first work out the valency of the metal M (we know that carbonate ion has a valency of −2):
Element / Ion M `"CO"_3^"2-"`
Valency 1 2
It is clear that M has a valency of 1.
Formula of iodide of M:
Element M I
Valency 1 1
Crossing the valencies, formula of the iodide of M is MI.
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