SSC SSC Selection Post (Phase 13) 2025 Mock Test General Science Chemistry Chemistry in Everyday Life

নীচের কোন সোডিয়াম যৌগ খর জলকে মৃদু করার জন্য ব্যবহৃত হয়?

1
Na2CO3
2
NaHCO3
3
NaOH
4
Na2SO4
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