Assertion :The highest oxidation state of $O s$ is $+ 8$ . Reason: Osmium is a 5d-block element.

Read the above assertion and reason and choose the correct option from the following.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Osmium has the electronic configuration $5 d^{6} 6 s^{2}$ . AS $6 d$ and $6 s$ are close in energy, all the 8 electrons can participate in bonding

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