defence exam Indian Coast Guard Assistant Commandant (GD/CPL) 2025 Test Series General Science Chemistry

সোডিয়াম ধাতু কিসে সংরক্ষণ করা হয় ?

1
কেরোসিনে
2
 জলে
3
 ইথারে
4
 অ্যালকোহলে
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