Verified Solution • 2025–26 Session
moderate
QAIPMT-2005-Ch-2485: NEET 2005 Chemistry - Class 11 AIPMT-2005-Ch-2485 Solution: \(H_2S\) gas when passed through a solution of cations…
gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because
Multiple Choice Options
- A presence of HCl decreases the sulphide ion concentration
- B solubility product of group II sulphides is more than that of group IV sulphates
- C presence of HCl increases the sulphide ion concentration
- D sulphides of group IV cations are unstable in HCl.
Step-by-Step Verified Solution
H 2 S _ H + + HS �
HCl _ H + + Cl �
In presence of HCl this ionization of H 2 S is
suppressed due to the presence of extra H + ions
from HCl and produces
less amount of sulphide ions due to common
ion effect, thus HCl decreases the solubility
of H 2 S which is sufficient to precipitate II nd
group radicals.