The milkman shifts the pH of the fresh milk from 6 to slightly alkaline (to decrease the rate of fermentation) because in alkaline condition milk does not set as curd easily.
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Chemical name of POP is calcium sulphate hemihydrate. It is written in this form because two formula units of CaSO₄ share one molecule of water.
The colours in ascending order of wavelength are: Violet, Indigo, Blue, after that Green, Yellow, Orange and lastly, Red. The wavelength of violet colour is the least (First stand in wavelength) and that of red (last stand in wave length) ...