what is magneson reagent, what is its chemical formula and name ?

Chemical name: 4-(4-NITROPHENYLAZO)RESORCINOL

4-(4-NITROPHENYLAZO)RESORCINOL Structure

 it is used for the detection of Mg in the salt analysis.

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magneson reagent is NO2- (benzne) - N=N - (2,4-dihydroxybenzene)

it is a blue coloured dye.

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 4- (4-nitrophenylazo) resorcinol 

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