Answer
During the eruption of the volcano, released hydrogen sulfide reacts with oxygen molecules from the air which produces sulfur dioxide and water:
$2H_{2}S + 3O_{2} -> 2SO_{2} + H_{2}O$
In the next chemical reaction, some of the sulfur dioxide molecules react with hydrogen sulfide:
$2H_{2}S + SO_{2} -> 3S + 2H_{2}O$
Sulfur dioxide that remains present in the air reacts with water molecules and forms acid rain.
Work Step by Step
During the eruption of the volcano, released hydrogen sulfide reacts with oxygen molecules from the air which produces sulfur dioxide and water:
$2H_{2}S + 3O_{2} -> 2SO_{2} + H_{2}O$
In the next chemical reaction, some of the sulfur dioxide molecules react with hydrogen sulfide:
$2H_{2}S + SO_{2} -> 3S + 2H_{2}O$
Sulfur dioxide that remains present in the air reacts with water molecules and forms acid rain.
