Fire extinguishers contain \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and...

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Fire extinguishers contain \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and which one of the following :-
(1) \( \mathrm{CaCO}_{3} \)
(2) \( \mathrm{NaHCO}_{3} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
\( \mathrm{P} \)
(3) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
(4) \( \mathrm{NaHCO}_{3} \)
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