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Coloured Compounds

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Find out total number of coloured compound(s) from following: BaCO_(3),HgO,PbSO_(4),Ag_(2)S,HgI_(2),PbO,CdS,AgNO_(2),PbCrO_(4)

Yellow coloured compound is:

Which of the following is coloured compound?

Among the following the coloured compound is

Among the following the coloured compound is .

Blue coloured compound are obtained when

2-4 dinitroaniline is treated with NaNO_(2) and dilute HCI at 280 K followed by reaction with anisole , forming a coloured compound . The structure of this coloured compound would be :

Picric acid is a yellow coloured compound. Its chemical name is

(a). A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (b). The solution of (B) The solution of (B) in boiling water on acidification with dilute H_2SO_4 gives a pink coloured compound (C).