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কোনটি বাফার (buffer) দ্রবণ?

C H_{3} C O O H + C H_{3} C O O N a

N H_{4} C l + N H_{4} O H

C H_{3} C O O H + C H_{3} C O O H N a

N H_{4} O H + N a C l

ANS : 1

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