REACTION WITH NITROUS ACID:

METHODS OF PREPARATION OF ALCOHOLS|REACTION OF NITROUS ACID WITH PRIMARY AMINES|REDUCTION OF CARBOXYLIC ACID AND ITS DERIVATIVE|FROM GRIGNARD REAGENT

Oxoacid of Nitrogen(Nitrous Acid and Nitric Acid) || Reaction of Metals with Nitric Acid || Heating OF Nitrates || Halides OF Nitrogen

Which of the following on reactions with nitrous acid, followed by treatment with NaOH produces a blue coluration?

Copper metal on treatemet with dilute HNO_(3) produces a gas X,X when passed through acidic solution of stannous chloride, a nitrogen containing compound Y is obtained. Y on reaction with nitrous acid produces a gas Z. Then

Nitrous acid is produced by reacting HCI with