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The choice of electrolyte for electrolysis depends on the specific reaction you want to achieve. However, to avoid toxic gas production, you can consider using electrolytes like potassium hydroxide (KOH) or sodium hydroxide (NaOH) for aqueous solutions. These electrolytes decompose into hydroxide ions (OH-) which are involved in many electrochemical reactions, and they are less likely to produce harmful gases compared to other options. Please note that even these electrolytes can produce some gases (like hydrogen and oxygen) during electrolysis, but these gases are generally considered less toxic than chlorine or fluorine.