Which of the following is considered a safe and commonly used type of disinfectant for household surfaces?

• A. Ethylene oxide
• B. Sodium hypochlorite (bleach)
• C. Formaldehyde
• D. Mercuric chloride

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the purpose of disinfectants, which are chemical agents used to eliminate or reduce harmful microorganisms on surfaces to prevent infection and contamination.
2. Step 2: Review the properties and common uses of each disinfectant option: Ethylene oxide is a gas used mainly for sterilizing medical equipment, Formaldehyde is a potent chemical used in laboratories but is toxic and not suitable for household use, Mercuric chloride is highly toxic and not safe for household environments.
3. Step 3: Identify Sodium hypochlorite (bleach) as a widely used disinfectant for household surfaces due to its effectiveness against a broad spectrum of microbes and its relative safety when used properly.
4. Step 4: Recognize that Sodium hypochlorite is commonly available in diluted forms suitable for household cleaning, making it the preferred choice among the options provided.
5. Step 5: Conclude that Sodium hypochlorite (bleach) is considered a safe and commonly used disinfectant for household surfaces compared to the other more hazardous chemicals listed.