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  4. If the supply of oxygen is limited, H2S reacts with O2 to form

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Q. If the supply of oxygen is limited, $ H_{2}S $ reacts with $ O_{2} $ to form

AFMCAFMC 2010The p-Block Elements - Part2

Solution:

In limited supply of oxygen, $H _{2} S$ burns with blue flame and $S$ and $H _{2} O$ are the main products.
$2 H _{2} S + O _{2} \longrightarrow 2 H _{2} O +2 S$
In excess of oxygen, $H _{2} S$ gives $SO _{2}$ and water as main product.