Metal which can easily release electron(s) in aqueous solution, is
1. Zn
2. Ag
3. Cu
4. Au

In what order the reagents Na_(2)S, NaCl and Nal are added to an aqueous solution containing Ag^(+), Cu^(+2) and Ni^(+2) ions in order to precipitate Ag^(+) first Cu^(+2) second and Ni^(+2) last.

Fe can displace which of the following ions from their aqueous solutions? (a) Na^(+) (b) Zn^(2+) (c) Cu^(2+) (d) Ag^(+)

Which of the following anion(s) is/are easily removed from aqueous solution by precipitation ?