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কোন গ্রুপে সব যৌগই আয়নিক ?

B e F_{2}, H C l, I C l, N F_{3}

N a B r, B a F_{2}, C s C l, K C l

N F_{3}, B a F_{2}, C s C l, H_{2} S

N a C l, N H_{3}, F_{2} O, C s C l

N a B r, N H_{3}, C H_{4}, B e F_{2}

ANSWER : 2

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