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  4. Aluminium sulphide gives a foul odour when it becomes damp. Write a balanced chemical equation for the reaction.

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Q. Aluminium sulphide gives a foul odour when it becomes damp. Write a balanced chemical equation for the reaction.

IIT JEEIIT JEE 1997The p-Block Elements

Solution:

$Al_2S_3 + 6H_2O \longrightarrow 2Al(OH)_3 \downarrow + \underset{\text{Foul odour}}{3H_2S(g)} \uparrow$
Foul odour on damping of $Al_2S_3$ is due to the formation of $H_2S$ gas as shown above.