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#10206 Bangladesh Studies General Level 0

প্রথম ট্রানজিশন ধাতু সিরিজের একটি ধাতু হতে প্রাপ্ত একটি M3+ আয়নে পাঁচটি ইলেক্ট্রন 3d সাবশেলে অবস্থিত । M3+ আয়নটি কী হতে পারে?

  1. A Cr3+
  2. B Fe3+
  3. C Mn3+
  4. D Sc3+
Answer: B - Fe3+

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