Question

Which term is the best match for the color of a chemical substance students make note of:
A.Qualitative data
B.Inference
C.Observation
D.Quantitative data
E.Hypothesis

Answer 1

Hint:To answer this question, you must be familiar with the terms given in the question. Data can be of two types namely, quantitative data and qualitative data. Quantitative analysis includes processes like volumetric, potentiometric titration etc.

Complete step by step answer:
Qualitative data is the data that deals with characteristics that cannot be measured but can be observed subjectively namely, smell, taste, texture, attractiveness, etc.
Inference is defined as the conclusion reached as a result of all the evidence and observations after reasoning.
An observation is the statement about some change that is smelled, seen or noticed.
Quantitative data is the data that deals with the numerical aspect and can be measured objectively namely, height, width, volume, etc.
A hypothesis is a proposed explanation made as a result of collected evidence as a basis for further investigation.
Using all the definitions above we can conclude that colour is a qualitative data that is noted by students as an observation.

So, the correct answer is C.
Note:
A chemical gets its colour due to the electrons absorbing energy and getting excited. The excited electron returns to its original state emitting the energy as radiation whose frequency lies in the visible region of the electromagnetic spectrum. The colour that we see is the complementary colour of the absorbed wavelengths. For instance, if a substance absorbs red coloured photons from white light, it shows its complementary color, that is green. The complementary colour pairs of all the coloured components of white light are
Red- green
Violet/ purple- lemon yellow
Blue- orange
If a substance absorbs all the component colors of light, then it is black in colour and if it reflects all the colors, then it is white in color.