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  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:

(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3

1 Answer

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Answer:

(a) 1 only

Explanation:

  • Controlled drug delivery in patients: Correct. Hydrogels are widely used in the medical field for controlled drug delivery due to their ability to absorb large amounts of water and release drugs at a controlled rate.

  • Mobile air-conditioning systems: Incorrect. Hydrogels are not typically used in mobile air-conditioning systems. These systems usually rely on refrigerants and other cooling technologies.

  • Preparation of industrial lubricants: Incorrect. Hydrogels are generally not used in the preparation of industrial lubricants. Industrial lubricants are typically formulated from oils and other chemical additives designed to reduce friction and wear in machinery.

Therefore, hydrogels are used in controlled drug delivery in patients, making option (a) the correct answer.

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