___________ is the commercially available form of formaldehyde in a 37% aqueous solution.

• A. Aldehyde.
• B. Formalin.
• C. Methanol.
• D. Hydrogen Peroxide.

Answer: (B)

Verified step by step guidance

1. Identify the main component of the solution in question, which is formaldehyde.
2. Understand that formaldehyde is often used in a solution form for commercial purposes.
3. Recognize that a 37% aqueous solution of formaldehyde is commonly referred to by a specific name.
4. Recall that this specific name is 'Formalin', which is the commercially available form of formaldehyde in a 37% aqueous solution.
5. Differentiate between other options like methanol and hydrogen peroxide, which are distinct chemicals with different uses and properties.