Analytical Chemistry Question 128
Question: $ H_2S $ Gas when passed through a solution of a contains $ HCl $ precipitates the cations of group of qualitative analysis but not those belonging to the fourth group. It is because
[CBSE PMT 2005]
Options:
A) Presence of $ HCl $ decreases the sulphides ion concentration
B) Presence of HCl increases the sulophide ion concentration
C) Solubility product of group II sulphides is more than that of group IV sulphides
D) Sulphides of group IV cations are in HCl.
Show Answer
Answer:
Correct Answer: A
Solution:
HCl suppresses ionisation of weakly dissociated $ H_2S $ , with the result only the ionic product of the sulphides of group II radicals exceed their corresponding solubility product and hence only these are precipitated.
BETA
