Question

Assertion :Coordination number of $Fe$ and $Co$ in $\left[Fe\right(C_2{O}_4{)}_3{]}^{3-}and\left[Co\right(en{)}_3{]}^{3+}$ respectively is 6 Reason: $C_2{O}_4^{2-}$ and en (ethane -1, 2-diamine) are didentate ligands.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$Fe$ atom in $\left[Fe\right(C_2{O}_4{)}_3{]}^{3-}$ is surrounded by three bidentate ligands. There six metal - ligand bonds. Hence, co-ordination number is 6.

$Co$ atom in $,\left[Co\right(en{)}_3{]}^{3+}$ is surrounded by three bidentate ligands. There six metal - ligand bonds. Hence, co-ordination number is 6.

Note:

$C_2{O}_4^{2-}$ and en (ethane -1, 2-diamine) are bidentate ligands.