Borax bead test - chemical analysis, Chemistry

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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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