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میتونی لایو بذاری!

When concentrated sulfuric acid is added to solid sodium chloride, HCl is formed but not Cl$_2$.

When concentrated sulfuric acid is added to solid sodium iodide, I$_2$ is formed.

Which statement explains these observations?

1 ) 

Sulfuric acid is an oxidising agent and chloride ions are more easily oxidised than iodide ions.

2 ) 

Sulfuric acid is an oxidising agent and iodide ions are more easily oxidised than chloride ions.

3 ) 

Sulfuric acid is a reducing agent and chloride ions are more easily reduced than iodide ions.

4 ) 

Sulfuric acid is a reducing agent and iodide ions are more easily reduced than chloride ions.

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Mahmoud Torkamani