The pair(s) of ions where BOTH the ions are precipitated upon passing gas in presence of dilute HCl, is(are)
← JEE Advanced 2015 · Paper 2
ChemistryMultiple correct+4 / -2Question 33 of 60
JEE Advanced 2015 · Paper 2, Chemistry question 33
Answer and worked solution
Official answer: C, D
H₂S in dilute HCl gives a low sulphide concentration, enough to precipitate only the group II sulphides: Cu²⁺, Pb²⁺, Hg²⁺, Bi³⁺ (and others).
- (A) Ba²⁺ and Zn²⁺ are not precipitated (Zn needs basic conditions). False.
- (B) Fe³⁺ is not group II. False.
- (C), (D) Both ions in each pair are group II. True.
(C), (D)
Topics:Cation analysis