pBlock ElementsII - Result Question 152

####40. A gas that cannot be collected over water is

(a) $N _2$

(b) $O _2$

(c) $SO _2$

(d) $PH _3$

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Solution:

  1. $SO _2$ cannot be collected over water because it reacts with water forming $H _2 SO _3$.

$$ SO _2+H _2 O \longrightarrow H _2 SO _3 $$



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