Problem 23 - A Complete Resource Book in Chemistry for JEE Main

Question

Which is used as an antiseptic? (a) iodoform (b) tincture of iodine (c) \(0.2\) of solution of phenol (d) all of these

Step-by-Step Solution

Answer

All options are used as antiseptics; the answer is (d) all of these.

Step 1: Understand antiseptics

Antiseptics are substances that prevent the growth of disease-causing microorganisms. They are used on living tissues, like skin, to reduce the risk of infection.

Step 2: Analyze each option

Let's go through each option: - Iodoform (option a) is known for its antiseptic properties and was historically used for this purpose. - Tincture of iodine (option b) is a well-known antiseptic solution. - Phenol solutions (option c), including the 0.2% concentration, are used as antiseptics for disinfecting skin and surfaces.

Step 3: Determine if all options are antiseptics

We need to check if each substance is used as an antiseptic: - Iodoform: Yes, it can be used as an antiseptic for wounds due to its antimicrobial properties. - Tincture of iodine: Yes, commonly known for its use as an antiseptic on minor cuts and abrasions. - Phenol solution: Yes, even at low concentrations (0.2%), it acts as an antiseptic on mild wounds.

Step 4: Conclude the correct answer

Since all three substances have antiseptic properties and are used as antiseptics, the correct answer is option (d) all of these.

Key Concepts

Iodoform

Iodoform, chemically known as triiodomethane, is a yellow crystalline solid with a distinctive odor. Historically, it has been used for its antiseptic properties, particularly in the early 20th century. Iodoform works by releasing iodine when it comes in contact with the skin or wound surface, which is effective against bacteria and fungi.

The use of iodoform often includes:

• Treating small cuts and bruises efficiently.
• Being part of ointments and medicinal dressings.
• Providing not only antiseptic qualities but also a local anesthetic effect.

However, due to its strong odor and the discovery of more effective antiseptics, its use has diminished over time. But understanding its chemical behavior and historical relevance remains crucial for chemistry students.

Tincture of Iodine

Tincture of iodine is one of the most widely recognized antiseptics used to clean wounds and prevent infections. It is an alcoholic solution of iodine, which is both potent and versatile in action.

Here are some key characteristics and uses:

• It works by converting free iodine molecules that penetrate microbial cell membranes, leading to the destruction of the microorganism.
• Commonly applied to minor cuts, scrapes, and small areas before surgery to reduce the risk of infection.
• Provides a quick and effective antiseptic action making it a choice for first aid kits and hospitals alike.

Despite its effectiveness, tincture of iodine might cause skin irritation in some individuals. Therefore, care must be taken, especially for those with sensitive skin.

Phenol Solution

Phenol, also known as carbolic acid, has been used as an antiseptic since the 19th century. A 0.2% phenol solution, although mild, is effective against a range of microorganisms. When diluted, phenol solutions provide a balance between efficacy and safety for antiseptic use.

The applications of phenol solution include:

• Disinfection of skin and minor wound areas.
• Acting as a skin sanitizer in various healthcare settings.
• Being part of throat sprays or lozenges for its antiseptic properties.

Given its potency, phenol is generally used in controlled applications and often combined with other compounds to enhance its safety profile. Its historical significance in the development of antiseptic protocols is invaluable for understanding the evolution of germ-control measures in medical chemistry.