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JEE Main 202127 JulyEvening Shift
Exam
JEE Main
Year
2021
Date
27 July
Shift
Evening Shift
Subject
Chemistry
Chapter
Practical Chemistry

JEE Main 2021 · 27 July · Evening Shift · Chemistry · Practical Chemistry

To an aqueous solution containing ions such as Al ^ 3 + , Zn ^ 2 +...

To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+{Al}^{3 +}, {Zn}^{2 +}, {Ca}^{2 +}, {Fe}^{3 +}, {Ni}^{2 +}, {Ba}^{2 +} and Cu2+{Cu}^{2 +} was added conc.HClconc . HCl, followed by H2S{H}_{2}S. The total number of cations precipitated during this reaction is/are :

Options

  1. A11
  2. B33
  3. C44
  4. D22

Correct answer

A. 11

Step-by-step solution

Al3+{Al}^{3 +} and Fe3+{Fe}^{3 +} sulphides hydrolyse in water. Ni2+{Ni}^{2 +} and Zn2+{Zn}^{2 +} require basic medium with H2S{H}_{2}S to form precipitate. Ca2+{Ca}^{2 +} and Ba2+{Ba}^{2 +} sulphides are also soluble. only Cu2+{Cu}^{2 +} can form the precipitate with H2S{H}_{2}S in the acidic medium.
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