Verified Answer :

Answer:

The correct answer is option 2, that is, carbonate.

Explanation:

A molecular ion, also known as a polyatomic ion, refers to a charged chemical ion or species comprising two or more atoms that are combined covalently, or of a complex of a metal, which can be regarded to be functioning as a single unit.  

Of the given options, acetate has two atoms of oxygen, carbonate has three oxygen atoms, hydroxide has one, and peroxide has two atoms of oxygen. Thus, carbonate has the highest number of oxygen atoms.  


Carbonate ion contains the greatest number of oxygen atoms. So, the correct option is (2).

 


Polyatomic ion: refers to a charged chemical ion or species made up of two or more covalently joined atoms, or a metal complex that can be considered to behave as a single unit.


Acetate(C2H3O−) has two atoms of oxygen, carbonate has three oxygen atoms\((CO_3^{2-})\), hydroxide\((OH)^{-}\) has one, and peroxide (\(H_2O_2\))has two atoms of oxygen. Thus, carbonate has the highest number of oxygen atoms.  

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