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Reactivity with Halogens and Hydrogen (Group 2)

Na2SO3, Na2...

Question

$N a_{2} S O_{3}$ , $N a_{2} S_{2} O_{3}$ , $N a_{2} C O_{3}$ , $N a_{2} C r O_{4}$ are separately treated with $A g N O_{3}$ solution. In how many cases is/are red ppt. obtained ?

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Solution

Only $N a_{2} C r O_{4}$ gives red ppt of $A g_{2} C r O_{4}$ on reaction with $A g N O_{3}$ . The compounds $A g_{2} S O_{3}$ and $A g_{2} S_{2} O_{3}$ are white in colour and $A g_{2} C O_{3}$ is yellow in colour.
$N a_{2} C r O_{4} + 2 A g N O_{3} \to A g_{2} C r O_{4} ↓ (r e d) + 2 N a N O_{3}$

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