Analytical Chemistry Question 54
Question: Reagent used in the qualitative analysis of IVth group is
Options:
A) $ HCl $
B) $ H_2S $ (alkaline)
C) $ {{(NH_4)}_2}S $
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
In presence of NH4OH, dissociation of H2S is remarkably high so increases the solubility product of IVth group sulphides $ H_2S $
$ 2{H^{+}}+{S^{2-}} $
$ NH_4OH\to NH_4^{+}+O{H^{-}} $
$ O{H^{-}}\ +\ {H^{+}}\ \to \ H_2O $
BETA
