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Borax bead test : The transparent glassy bead while heated along with inorganic salt and the colour produced gives some idea of cation present in it.
Table:
Colour of bead in oxidising flame
Colour of bead in reducing flame
Basic radical present
Greenish when hot, blue in cold.
Red and opaque
Cu
Dark green in hot and cold
Same
Cr
Deep - blue
Deep blue
Co
Yellow when hot
Green
Fe
Violet in hot and cold
Colourless
Mn
Brown in cold
Grey or black or opaque
Ni
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Phenol + HNO3(in prescence of sulphuric acid) --> 2-nitrophenol + 4-nitrophenol.
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Volumetric method for acids and bases - chemical methods Molecular mass of an acid can be ascertained by dissolving a known mass of the acid in water and titrating the solution
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