In some foam-type fre extinguishers, the treactants are `Al_2 (SO_4)_3` (aq) and `NaHCO_3` (aq). T=When the extinguisher is activated, these reactants are allowed to mix producing `Al(OH)_(3(s))` and ` CO_(2(g))`. The ` al (OH)_3 - CO_2` foram extinguishes the fires .
Net ionic reaction of the above chemical chamge is :
A. `Al^(3+) + HCO_3^Θ+ H_2 O rarr Al (OH)_3 + CO_2`.
B. `Al^(3+) + HCO_3^Θ + OH overset (Θ) rarr Al(OH)_3 + CO_2 +H_2 O`
C. `[Al(H_2O)_6]^(3+) HCO_3^Θ rarr Al(OH)_3 + CO_2 +H_2 O`
D. `Al_2 (SO_4)_3 + NaHCO_3 rarr Na_2 SO_4 + Al(OH)_3 + H_2O`.
