Find total number of metal cations which are pfted as metal sulphide on passing H2S gas through metal salt solution. Pb2+(aq.), Mn2+(aq.), Sn2+(aq.), Cr3+(aq.), Mg2+(aq.), Hg2+(aq.), Cu2+(aq.), Ag+(aq

Question

Find total number of metal cations which are pfted as metal sulphide on passing H2S gas through metal salt solution. Pb2+(aq.), Mn2+(aq.), Sn2+(aq.), Cr3+(aq.), Mg2+(aq.), Hg2+(aq.), Cu2+(aq.), Ag+(aq.), Al3+(aq.), Ni2+(aq.)

Prashant Kotian · Accepted Answer

Correct answer: **5** / H2S/H+ GIVES PPT. WITH 1ST AND 2ND GROUP RADICALS (PB2+, SN2+, HG2+, CU2+, AG+). AL3+, MG2+, CR3+ DO NOT FORM STABLE SULPHIDES IN AQUEOUS MEDIUM.. Step 1: Identify the initial state of the reactants. Zinc hydroxide, Zn(OH)2↓, is an insoluble amphoteric white precipitate. Step 2: Observe the reaction with strong base. When excess sodium hydroxide (NaOH) is added, the precipitate reacts to form soluble sodium zincate (Na2ZnO2). Step 3: Because the insoluble precipitate dissolves to form a clear solution of a soluble complex salt, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).

💡 Solution & Explanation

Practice 22,000+ questions like this