Hydrogen And Its Compounds Question 87
Question: Hardness of water is due to presence of salts of
[BHU 2005]
Options:
A) $ N{a^{+}} $ and $ {K^{+}} $
B) $ C{a^{2+}} $ and $ M{g^{2+}} $
C) $ C{a^{2+}} $ and $ {K^{+}} $
D) $ C{a^{2+}} $ and $ N{a^{+}} $
Show Answer
Answer:
Correct Answer: B
Solution:
Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of $ Ca $ and $ Mg $ on it. These $ C{a^{2+}} $ and $ M{g^{2+}} $ ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.
BETA
