wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Chemical A is used for water softening to remove temporary hardness, A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A?

A
CaCO3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
CaO
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Ca(OH)2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Ca(HCO3)2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is D Ca(OH)2
The chemical A is calcium hydroxide (Ca(OH)2). It is used for water softening to remove temporary hardness.
It reacts with sodium carbonate to form caustic soda.
Na2CO3+Ca(OH)2CaCO3+NaOH.
With carbon dioxide gas, it forms calcium carbonate which turns lime water milky.
Ca(OH)2+CO2CaCO3+H2O

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Calcium Carbonate
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon