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Question

Which of the following does not represents a polyatomic ion?

A
Sulphite
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B
Chloride
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C
Sulphate
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D
Phosphate
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Solution

The correct option is B Chloride

A polyatomic ion is an ion composed of more than one atoms.
Sulphite, sulphate and phosphate ions are polyatomic as they contain more than one atoms. However, Cl- is a monoatomic ion as it is composed of only chlorine atom. Ions with their formula and charge is given in the following table:
IonFormulaChargeSulphite(SO3)2-2Sulphate(SO4)2-2Phosphate(PO4)3-3Chloride(Cl)-1


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