Question

Nano materials not applied in

• A. Manufacturing of scratch proof glasses
• B. Electronic devices
• C. Conventional water treatment
• D. self cleaning material

Hint:

Nano materials suit special uses like glass coatings, electronics and self cleaning surfaces.

Answer 1

The Correct Option is C

Step 1: Check each use:
Nano silica or alumina gives hard scratch-resistant glass. Nano devices dominate modern electronics. Nano TiO$_2$ makes surfaces self cleaning.

Step 2: Water treatment:
Conventional treatment plants use coagulation, sedimentation, filtration and disinfection, which are bulk methods.

Step 3: Answer:
So option (C) is the odd one out.

Final Answer:
Conventional water treatment is the odd one out. \[ \boxed{\text{(C) }\text{Conventional water treatment}} \]