Analytical Chemistry Question 121
Question: In qualitative analysis, in order to detect second group basic radical, $ H_2S $ gas is passed in the presence of dilute HCl to
[KCET 2004]
Options:
A) Increase in dissociation of $ H_2S $
B) Decrease the dissociation of salt solution
C) Decrease the dissociation of $ H_2S $
D) Increase the dissociation of salt solution
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Answer:
Correct Answer: C
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
