[IIT-JEE (Screening) 2005]
A) $ NO_2 $
B) $ O_2 $
C) $ N_2 $
D) $ N_2O $
Correct Answer: B
$ PbO_2 $ is a powerful oxidizing agent and liberate $ O_2 $ when treated with acids $ SO,\ O_2 $ gas will be evolved.
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