1.

The solution of which does not produce precipitate when treated with K_(2)CO_(3) is

Answer»

`BaCl_(2)`
`CaBr_(2)`
`MgCl_(2)`
`Na_(2)SO_(4)`

Solution :SINCE the carbonates of only alkali metals are soluble in `H_(2)O` while those of all other metals are insoluble in `H_(2)O` , therefore , `Na_(2)SO_(4)` does not produce a ppt. with `K_(2)CO_(3)`.


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