Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemistry in Everyday Life
Name the sodium compound which is used to permanently remove the hardness of water.
1
Sodium hydroxide
2
Sodium hydrogen carbonate
3
Sodium carbonate
4
More than one of the above
5
None of the above