Question

A gas that cannot be collected over water is

• A. $N_2$
• B. $O_2$
• C. $SO_2$
• D. $PH_2$

Answer 1

Answer: (C)

$SO_2$

Answer 2

$SO_2$ cannot be collected over water because it reacts with
water forming $H_2SO_3.$
$SO_2+H_2O \longrightarrow H_2SO_3$