Verified Answer :

PhyCS

(3) the Phosphate ion has a charge of 3-. 
\(\text{PO}_4^{-3}\)

Answer: (3) phosphate ion

Explanation: A polyatomic ion is a ion which contains different atoms.

1) Chromate ion is a polyatomic ion containing chromium and oxygen with formula \(CrO_4^{2-}\)

2) Oxalate ion is a polyatomic ion containing carbon and oxygen with formula \(C_2O_4^{2-}\)

3) Phosphate ion is a polyatomic ion containing phosphorous and oxygen with formula \(PO_4^{3-}\)

4) Thiocyanate ion is a polyatomic ion containing sulfur, carbon and nitrogen with formula \(SCN^{-}\)


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