What is german silver?
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Mention a few advantages of photoelectric colorimetric determination.
Explain the Molecule?
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?
Why do clothes dry quicker in wind than in still air ?
How is water purified on large scale, for drinking ?
Which metal is used for coating the backs of the mirrors ?
How is food preserved ?
What is meant by amalgam ?
Why ate the electric fuses used in an electric current ?
Why white clothe are preferred to dark ones in summer ?
Why cooling is produced when a wet ?khus khus? screen is hung on the doors and windows ?
Why do we hear thunder after seeing a flash of lightning ?