Voici les solutions à vos questions :

Voici les solutions à vos questions :

d) Le montage suivant a été utilisé pour préparer et tester un gaz en laboratoire.

i) Qu'observez-vous dans le tube contenant la solution de $K_2Cr_2O_7$ ?
Le dioxyde de soufre ($SO_2$) est un agent réducteur. La solution de dichromate de potassium ($K_2Cr_2O_7$) est un agent oxydant orange. Lorsque le $SO_2$ est introduit, le dichromate orange ($Cr_2O_7^{2-}$) est réduit en ions chrome(III) verts ($Cr^{3+}$).
Observation : La solution orange $\boxed{\text{devient verte}}$.

ii) Identifiez le gaz produit dans le premier tube à essai A.
La réaction entre le sulfite de sodium ($Na_2SO_3$) et l'acide chlorhydrique ($HCl$) produit du dioxyde de soufre.
Gaz : $\boxed{\text{Dioxyde de soufre } (SO_2)}$

iii) Indiquez un test physique pour le gaz produit dans le tube à essai A.
Le dioxyde de soufre est un gaz incolore avec une odeur caractéristique.
Test physique : Il a une $\boxed{\text{odeur piquante et suffocante}}$.

e) Un étudiant dispose des mélanges suivants.
Complétez le tableau suivant en suggérant la méthode de séparation.

| Mélange | Méthode de séparation | | :-------------------------------- | 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