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 :
A
1 only
Correct answer
B
1 and 2 only
C
2 and 3 only
D
1, 2 and 3
Explanation
Hydrogels are water-swollen polymer networks widely used for controlled drug delivery, releasing medicine slowly in response to conditions in the body, so statement 1 is correct. UPSC's key does not accept mobile air-conditioning or industrial lubricants as established uses: hydrogel-based cooling is still experimental, and industrial lubricants are oil-based or synthetic. So 1 only.
Physical Sciences, Chemistry & Materials