Question

Which is an advantage of using chemical indicators?

They are inexpensive to use.
They have very limited use.
They require the use of electricity.

Answer 1

Are you sure those are the only answer choices? Typically a chemical indicator is advantageous because results are almost immediate and very easy to read.

I would say to rule out the second option simply because "limited use" doesn't sound like it would be an advantage.

Answer 2

I am thinking the answer is the first choice if you need to choose from that list. Requiring the use of electricity doesn't sound like an advantage either. Hope it helps!

Answer 3

I think the answer would be one they are inexpensive. Comparing with pH meters they are less expensive. !