Hydrogen And Its Compounds Question 244
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-
Options:
A) $ CaCO_3 $
B) $ CaO $
C) $ Ca{{(OH)}_2} $
D) $ Ca{{( HCO_3 )}_2} $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ Ca{{(OH)}_2} $ is used for the softening of temporary hard water. $ Ca{{( OH )}_2}( aq )\xrightarrow{CO_2}\underset{cloudiness}{\mathop{CaCO_3( s )}}+H_2O( I ) $
BETA
