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Number of electrons in t2g orbital of compound formed by reacting

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Number of electrons in t2g orbital of compound formed by reacting [Co(H2O)]2+ with excess NH3 in the presence of air is :

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Correct answer is 6

[Co(H2O)6]2+ +6NH3→ [Co(NH3)6]3+ + 6H2O + e-

NH3 with Co3+ acts as a strong ligand. 

Hence, all 6 electrons of Co will be present in t2g orbital.

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