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A fire extinguisher contains H2SO4 and which of the following substances?
- BaCO3
- NaHCO3 solution
- Na2CO3
- CaCO3
Correct answer: NaHCO3 solution
Solution
The soda-acid fire extinguisher contains dilute H2SO4 in one container and NaHCO3 solution in the other. When the extinguisher is inverted, the two mix and produce CO2 gas, which expels the liquid and smothers the fire. BaCO3 is insoluble and would not react readily. Na2CO3 is used in dry powder extinguishers, not the soda-acid type.
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