[AFMC 1980]
A) $ CaCO_3 $
B) $ Na_2CO_3 $
C) $ NaHCO_3 $
D) $ NaHCO_3 $ and $ Na_2CO_3 $
Correct Answer: D
$ NaHCO_3 $ and $ Na_2CO_3 $ decompose to give $ CO_2 $ which extinguishes fire.
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