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How many of the following are correct.
i) A white precipitate is obtained when a solution of $B a C l_{2}$ is treated with $N a_{2} S O_{3}$
ii) A white precipitate is obtainied when a solution of $N a A l O_{2}$ is heated with $N H_{4} C l$
iii) A white precipitate is obtained when $H_{2} S$ is passed through a solution of $Z n S O_{4}$
iv) A white precipitate is obtained when a solution of $Z n S O_{4}$ is treated with $N a_{2} C O_{3}$

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answer is 3.

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Detailed Solution

$i) {BaCl}_{2} + {Na}_{2} {SO}_{3} \to {BaSO}_{3} + 2 NaCl$ White colour

$ii) {NaAlO}_{2} + {NH}_{4} Cl \to {NH}_{3} ↑ + NaCl + Al (OH)_{3}$ White

$iii) {ZnSOO}_{4} + H_{2} S \to$ No reaction

$iv) {Na}_{2} {CO}_{3} + {ZnSO}_{4} \to {ZnCO}_{3} + {Na}_{2} {SO}_{4}$ White ppt

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