Question

The formula of carbonate of a metal M is MCO3. What will be the formula of: (a) its bromide (b) its sulphate (c) its phosphate?

Answer 1

i hope this anser is right!!

Answer 2

The formula of bromide is $MBr_2$ , sulphate is $MSO_4$ and phosphate is $M_3(PO_4)_2$

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here element M is having an oxidation state of +2 called as $M^{2+}$ cation and $CO_3^{2-}$ is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MCO_3$

The formula of metal bromide will be $MBr_2$ where bromine has oxidation state of -1. The formula of metal sulphate will be $MSO_4$ where sulphate has oxidation state of -2.The formula of metal phosphate will be $M_3(PO_4)_2$ where phosphate  has oxidation state of -3.

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