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Q.

To an aqueous solution of AgNO3 some NaOH(aq) is added, till a brown ppt is obtained. To this H2O2 is added dropwise. The precipitate turns black with the evolution of O2. The black ppt is

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a

Ag

b

AgOH

c

Ag2O

d

Ag2O2

answer is D.

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Detailed Solution

AgNO3 + NaOH →AgOH + NaNO3 
AgOH→Ag2O + H2O
2Ag2O →4Ag + O2

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