JEE Main 202127 Jul, Evening shiftChemistryEasyPrinciples Related to Practical Chemistry54× since 2004
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 :