"The size of the atom (molecule) are caused the colour of the substanc

1.	"The size of the atom (molecule) are caused the colour of the substance ". How do you prove it ?
Answer» Solution :1) Take a solution of sodium-thio-sulphate(hypo) and SULPHURIC acid in a glass beaker. 2) Place the beaker in an open place where abundant sunlight is available. 3) Watch the formation of grains of SULPHUR and observe changes in the beaker. 4)Sulphur precipitates as the reaction is in progress. 5) At the begining, the grains of sulphurare smaller in size and appear blue in colour. Asthe reaction progresses, the size of grains increases and slowly their colour becomes white. 6) At the beginning, the size of grains is small and almost comparable to the wavelength of blue light. HENCE they appear blue. 7) As the size of grains increases their size becomes comparable to the wavelengths of other COLOURS and thesegrains act as scattering CENTRES for other colours. 8) The combination of all these colours appears as white.

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