In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfollowedby acorrespondingstatementof Reason(R ) Justbelow it . Of thestatementmarkthe correctanswer as Assertion. Thehighestoxidationstateof Os is + 8. Reason . Osmiumis a 5d- block element .

In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfol

1.	In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfollowedby acorrespondingstatementof Reason(R ) Justbelow it . Of thestatementmarkthe correctanswer as Assertion. Thehighestoxidationstateof Os is + 8. Reason . Osmiumis a 5d- block element .
Answer» Solution :Correctexplanation .Theelectronicconfigurationof Os is `[Xe] 6s^(2)4f^(14)5d^(6)6s^(2) `. Sinceit has8 electrons in thevalenceshell`(5d 6s^(2))` thereforeit has thehighestoxidation STATEOF + 8 .