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নিম্নোক্ত কোনটি অম্লধর্মী সার ?

  1. A অ্যামোনিয়াম নাইট্রেট
  2. B অ্যামোনিয়াম সালফেট
  3. C ইউরিয়া
  4. D সবগুলো
Answer: D - সবগুলো

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