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Find out total number of cation(s) that ...

Find out total number of cation(s) that produce precipitate with aqueous solution of `Na_(2)CO_(3)`.
`Cu^(2+)(aq.),Mg^(2+)(aq.),Fe^(3+)(aq.),Pb^(2+)(aq.),Al^(3+)(aq.),Hg^(2+)(aq.),Zn^(2+)(aq.),NH_(4)^(+)(aq.),Cs^(+)(aq.)`

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Verified by Experts

The correct Answer is:
7
All carbonates are water insoluble except `(NH_(4))_(2)CO_(3)` and alkali metal carbonates.
thus `(NH_(4))_(2)CO_(3) and Cs_(2)CO_(3)` are only water soluble while others are insoluble.
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