Answer :

In activity 3, silver nitrate is a reagent used to test for the presence of Aldehyde

What is the use of silver nitrate test?

In chemistry, there is a reagent known as Tollens' reagent which is an alkaline solution of ammoniacal silver nitrate that is used to test for aldehydes.

Now, Silver ions in the presence of hydroxide ions come out of solution as a brown precipitate of silver(I) oxide, Ag₂O(s). This precipitate dissolves in aqueous ammonia, forming the diamine silver(I) ion,

Thus, in activity 3, silver nitrate is a reagent used to test for the presence of Aldehyde.

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