Question

Available capacity(s) of the standard measuring flask is/are:
A) 50ml
B) 100ml
C) 200ml
D) All of these

Answer 1

Hint: We have all used a glass type object with a long beak and a flat bottom with marking etched on each level. One needs to choose the available given volumetric choices that the glass-like object can hold.

Complete step by step answer:
Measuring flasks are also called volumetric flasks, graduated flask, etc. It is essentially a piece of equipment that is used in the laboratories, it can also be called a laboratory flask. The measuring flask is special than regular measure glass as it can be calibrated to contain a precise volume of liquid at a given temperature. These flasks are used especially in chemistry labs where there is a requirement of precise dilutions and preparations of standard solutions. The shape of the glass is usually pear-shaped with a bottom which is flat. The measuring glass is usually made with non-reactive material such as borosilicate glass or plastic. The solution inside the measuring flask should not react with the measuring flask. The measuring flasks have clear markings on them which are generally etched on the flask, these markings are there to indicate the volume of liquid contained in them. There is also a label attached to the flask which indicates the nominal value, tolerance, precision class, relevant manufacturing standards and the manufacturer's logo. Volumetric flasks are of various sizes, containing from 1 millilitre to 20 litres of liquid.
There are particular standards defined for volumetric or measuring flasks. The standards are defined on the basis of tolerance and various other factors. These specifications and standards are given by ASTM E288, E542, E694, ISO 1042 and GOST 1770-74. Accordingly, these flasks come in two different classes. One is known as high standard and another is low standard flasks. According to individual needs, one can choose the type flask. So, according to the above analogy, all options are correct.

$\therefore$ Available capacities of standard measuring flask are: 50ml, 100ml, 200ml. Option (D) is correct.

Note:
Here one needs to define the meaning of measuring flask, then explain about the flask and then define the flask standards, along with it one has to compare the measuring flask with the regular measuring glass and state the differences between the two.