Question

What is true about working with burets?

Answer 1

Answer:

2. No graduation marks appear above the 0 mL mark.

Explanation:

A buret is a long graduated tube often used to administrate measured volumes of liquid, it has an opened extreme with a closed extreme in which the pass of the liquid can be determined, they often start at 0 ml and go down depending on the graduation. That´s why there is no graduation marks above the 0.

Answer 2

I believe the answer is 2. No graduation marks appear above the 0 mL. 
A buret is a piece of volumetric glassware used to deliver variable liquid amounts typically for titrations. It is a long glass cylinder open at one end and fitted at the opposite end with a stopcock valve. The stopcock valve controls the flow of liquid from the cylinder through the buret tip. The numbering of the markings begins at the top of the buret. Therefore, the volume delivered can be determined from the difference between initial and final liquid levels.