In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants. Select the correct answer using the code given below:

In which of the following are hydrogels used? 1. Controlled drug…

1 only
1 and 2 only
2 and 3 only
1, 2 and 3

Answer

1, 2 and 3

1. Controlled drug delivery in patients — Correct. Hydrogels are highly water-absorbent polymer networks used in biomedical applications, especially for controlled/sustained drug release.

2. Mobile air-conditioning systems — Correct. Hydrogels can be used as desiccants/moisture-absorbing materials in cooling and air-conditioning systems, including mobile systems.

3. Preparation of industrial lubricants — Correct. Certain hydrogels/polymer gels are used in gel-based lubricants and industrial lubrication formulations because they can retain water/oil and modify viscosity.

Hence, all three statements are correct.

1, 2 and 3

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