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Choose the principle common to all classical test tube tests used to detect a su...

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Choose the principle common to all classical test tube tests used to detect a substance:

the substance being tested

is oxidized, at the same time there is a reduction of the reagent manifested by

a change in colour or the formation of a precipitate

formation of turbidity to

precipitate using various precipitating agents

reaction of the substance being tested with sodium nitroprusside to form a purple to purple complex

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