JEE Main 2021 — Salt Analysis Question with Solution
From: JEE Main 2021 (Online) 27th July Evening Shift
Question
To an aqueous solution containing ions such as Al3+, Zn2+, Ca2+, Fe3+, Ni2+, Ba2+ and Cu2+ was added conc. HCl, followed by H2S.
The total number of cations precipitated during this reaction is/are :
The total number of cations precipitated during this reaction is/are :
Choose an option
Show full solutionCorrect option: A
Correct answer
A1
Step-by-step explanation
Al3+ and Fe3+ sulphides hydrolyse in water.
Ni2+ and Zn2+ require basic medium with H2S to form ppt
Ca2+ and Ba2+ sulphides are soluble
hence, we will receive only CuS ppt.
Ni2+ and Zn2+ require basic medium with H2S to form ppt
Ca2+ and Ba2+ sulphides are soluble
hence, we will receive only CuS ppt.
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This is a previous-year question from JEE Main 2021, covering the Salt Analysis chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.