🔍 Key Concepts

• Electrolysis of water that occurs during charging of lead-acid batteries • Gases produced at the positive and negative plates during charging • Which battery-related gases are flammable vs. which are toxic/poisonous

💭 Think About

• When a lead-acid battery charges, what happens to the water in the electrolyte at the molecular level? • Which gases are normally produced by this process, and what are their main hazards—fire/explosion or toxicity? • Looking at the choices, which gas or gas mixture is realistically produced in a lead-acid battery room?

✅ Before You Answer

• Verify which gases (by name) are actually produced in lead-acid battery charging • Decide whether the primary concern is explosion/flammability or poison inhalation • Eliminate any options that mention gases that are not normally produced by lead-acid batteries