Teaching TS DSC Secondary Grade (సెకండరీ గ్రేడ్ టీచర్) Teacher 2024 Mock Test General Science Chemistry Basic Concepts of Chemistry

কোন যৌগ জলের অস্থায়ী খরতার জন্য দায়ী ?

1
Mg(HCO3)2
2
CaCl2
3
MgSO4
4
CaCO3
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