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Chemistry Question on coordination compounds

Which of the following is diamagnetic?

A

[Mn(H2O)6]2+\left[M n\left(H_{2} O\right)_{6}\right]^{2+}

B

[Cu(H2O)6]2+\left[Cu\left(H_{2} O\right)_{6}\right]^{2+}

C

[Co(NH3)6]3+\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}

D

[Co(H2O)6]2+\left[ Co \left( H _{2} O \right)_{6}\right]^{2+}

Answer

[Co(NH3)6]3+\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}

Explanation

Solution

[Co(NH3)6]3+\left[ Co \left( NH _{3}\right)_{6}\right]^{3+} is diamagnetic ion due to absence of unpaired electron. Its geometry is octahedral.