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Question 54 of 56

Q.Tollen's Reagent is

(a) Ammoniacal cuprous chloride
(b) Ammoniacal cuprous oxide
(c) Ammoniacal silver nitrate
(d) Ammoniacal silver nitrite
West Bengal WbchseWest Bengal HS (WBCHSE) Board 2025MCQ· 1mImportance★★★★★
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Tollens' reagent is freshly prepared ammoniacal silver nitrate, used to test for aldehydes via the silver-mirror test.

Tollens' reagent is prepared by adding aqueous ammonia to silver nitrate solution until the initially formed precipitate of AgOHAgOH/Ag2OAg_2O just dissolves, giving the soluble diammine silver(I) complex [Ag(NH3)2]+OH−[Ag(NH_3)_2]^+OH^- — i.e. ammoniacal silver nitrate.

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