1.

Assertion : The highest oxidation state of osmium is +8. Reason : Osmiumis a 5d -block element.

Answer»

Both assertion and REASON are true and reason is the correct explanation of the assertion .
Both assertion and reason are true but reason is not the correc explanation of assertion.
Assertion is not true for reason is true
Both assertion and reason are false.

Solution :Correct explanation. Osmium has the electronic configuration `5d^(6) 6s^(2) `. As 5d and 6s are CLOSE in ENERGY , all the 8 electrons can participate in bonding.


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