$$ \text { Assertion : } $$
is named as tetrakis (ethylene-diammine) $\mu$-hydroxo-m-imido dicobalt (III) ion. Reason : In naming polynuclear complexes i.e., containing two or more metal atoms joined by bridging ligands, the word $\mu$ is added with hyphen before the name of such ligands.

• Correct answer
  A

  If both assertion and reason are true and reason is the correct explanation of assertion
• B

  If both assertion and reason are true but reason is not the correct explanation of assertion
• C

  If assertion is true but reason is false
• D

  If both assertion and reason are false.

Solution

is named as tetrakis (ethylenediammine)- $\mu$-hydroxo- $\mu$-imido dicobalt (III) ion. For more than one bridging group the word $\mu$ is repeated before each bridging group.

Hence, the correct answer is option: 'A'.