Analytical Chemistry Question 74
Question: $ A{l^{3+}}, $ $ F{e^{3+}}, $ $ Z{n^{2+}} $ and $ N{i^{2+}} $ ions are present in an acidic solution. Excess of ammonium chloride solution is added followed by addition of ammonium hydroxide solution. The available precipitate will contain
[MP PMT 1996]
Options:
A) $ Zn{{( OH )}_2} $ and $ Ni{{( OH )}_2} $
B) $ Al{{( OH )}_3} $ and $ Fe{{( OH )}_3} $
C) $ Zn{{( OH )}_2} $ and $ Al{{( OH )}_3} $
D) $ Ni{{( OH )}_2} $ and $ Fe{{( OH )}_3} $
Show Answer
Answer:
Correct Answer: B
Solution:
As the concentration of $ O{H^{-}} $ ions is less due to common ion effect but enough to precipitate the IIIrd group radicals as hydroxides, as the solubility product of III group hydroxides is lower than IV, V and VI group hydroxides.
BETA
