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কোন দু,টি যৌগ জলীয় দ্রবণে অম্লীয়?

N H_{4} C l, N a_{2} C o_{3}

C a C l_{2}, N a_{2} S o_{4}

N H_{4} C l, N a_{3} P O_{4}

N H_{4} C l, A l C l_{3}

ANS : 4

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