Verified Answer :

BaSO4 
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Answer: \(BaSO_4\)

Explanation:

A precipitation reaction is a special type of double displacement reaction.

\(BaSO_4\) is an insoluble compound as it is does not dissolve in water, and thus formed as a soild or a precipitate.

The sulfate ion \(SO_4{2-}\) form insoluble compounds when combined with \(Ba^{2+}\).

The chlorate ion \(ClO_3^-\) form soluble compounds with all positive ions.  


The chromate ion \(CrO_4^{2-}\) form insoluble compounds with all ions but soluble with \(Ca^{2+\).


The sulfide ion \(S^{2-}\) form insoluble compounds with all ions except when combined with \(Na^+\) or \(NH_4^+\)

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