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Question

To an aqueous solution of AgNo3 some NaOH (aq) is added, till a brown ppt. is obtained. To this H2O2 is added dropwise. The ppt. turns black with the evolution of O2. The black ppt. is


A

Ag2O

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B

Ag22

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C

AgOH

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D

None of these

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Solution

The correct option is A

Ag2O


AgNO3 + NaOH ---> AgOH + NaNO3

2AgOH ---> Ag2O + H2O

(Black ppt.)

Ag2O+ H2O2 ---> 2Ag+H2O+O2


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