Question

Which of the following is effectively used to remove E. coli bacteria from water?

• A. Silver nanoparticles
• B. Carbon black nanoparticles
• C. \(\mathrm{TiO}_{2}\) nanoparticles
• D. Silicon nanoparticles

Hint:

Silver nanoparticles have strong antibacterial action.

Answer 1

The Correct Option is A

Step 1: Known Application
Silver ions released from nanoparticles damage the bacterial cell membrane and enzymes.

Step 2: Elimination
The other options are not used mainly as bactericides.

Step 3: Result
Option (A).

Final Answer:
Silver nanoparticles act as the bactericide. \[ \boxed{\text{(A) }\text{Silver nanoparticles}} \]