A white precipitate is obtained when:

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Problem

A white precipitate is obtained when: (1) a solution of

\text{BaCl}_2

is treated with

\text{Na}_2\text{SO}_3

(2) a solution of

\text{NaAlO}_2

is heated with

\text{NH}_4\text{Cl}

(3)

\text{H}_2\text{S}

is passed through a solution of

\text{ZnSO}_4

(4) a solution of

\text{ZnSO}_4

is treated with

\text{Na}_2\text{CO}_3