Question

What is qualitative analysis?
A.Identification of unknown substance by direct observation
B.Identification of unknown substance by chemical tests
C.Both A & B
D.None of the above

Answer 1

Hint: In qualitative analysis treatment the properties of unknown substances are determined by reacting it with several reagents. This branch deals with the identification of elements. For a mixture this analysis is carried out to identify the component substances present in it.

Complete step by step answer:
Qualitative analysis simply tells us what types of substances are present in a sample. It basically determines the chemical composition of a sample. Such analysis helps in determining the presence of various ions, groups or compounds in the given mixture. It involves various chemical tests based on which the identification of unknown substances is done.). Examples of chemical tests are like Iodine test for starch, Kastle-Meyer test for blood, etc. There are two branches for qualitative analysis namely Organic and Inorganic. Organic qualitative analysis depicts the type of functional groups and chemical bonds present in the sample whereas inorganic qualitative analysis helps in depicting the ionic and elemental composition of sample by examining the ions in aqueous solution.
Properties like boiling point, precipitation, change in the color of sample, melting point, etc. can be measured with the help of such type of analysis.

So, the correct choice is (B).

Note:
There is also another treatment known as Quantitative Analysis. It tells us about how much unknown substances are present in the sample, basically their quantities or concentrations. Titration is one of the examples for such kind of analysis. Qualitative analysis on the other hand does not involve any numerical values but characteristics of the unknown substances.