JEE Main 2015 · 10 Apr · Shift 1 · Chemistry Q60

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ChemistrySingle correct+4 / -1Question 60 of 90

The cation that will not be precipitated by $\ce{H2S}$ in the presence of dil HCl is :

\ce{Cu^2+}

\ce{Pb^2+}

\ce{As^3+}

\ce{Co^2+}

Answer and worked solution

Official answer: D

Group II sulphides ( $\ce{Cu^2+}$ , $\ce{Pb^2+}$ , $\ce{As^3+}$ ) precipitate with $\ce{H2S}$ in acid. $\ce{Co^2+}$ (group IV) needs the higher sulphide concentration of an ammoniacal medium.

Topics:Cation analysis

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JEE Main 2015 · 10 Apr · Shift 1, Chemistry question 60