Hydrogen And Its Compounds Question 186
Question: Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When $ CO_2 $ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A
[Pb. CET 1990; AIIMS 1999]
Options:
A) $ CaCO_3 $
B) CaO
C) $ Ca{{(OH)}_2} $
D) $ Ca{{(HCO_3)}_2} $
Show Answer
Answer:
Correct Answer: C
Solution:
$ Ca{{(OH)}_2} $ is used for the softening of temporary hard water. $ Ca{{(OH)}_2}(aq)+CO_2(g)\to \underset{cloudiness}{\mathop{CaCO_3(s)}}+H_2O(l) $
BETA
