Why don't we mix chorine bleach with other acidic cleaning??

Chlorine bleach contains hypochlorite (OCl‑) and chloride (Cl-) ions. When an acid solution is added, the hydrogen ions (H+) in the acid solution would react with these ions to give chlorine gas (Cl2­).

2H+(aq) + OCl-(aq) + Cl-(aq) → H2O(l) + Cl2(g)

It is very dangerous because chlorine gas is poisonous.
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