Assertion :The maximum oxidation state of chromium in its compounds is +6 Reason: Chromium has only six electrons in $n s$ and $(n - 1) d$ orbitals

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Since Chromium $C r$ has an electronic configuration of $[A r] {3 d}^{5} {4 s}^{1}$ ,its maximum oxidation state can be + $6$ ,reason being it has only six electrons in $(n - 1) d$ and $n s$ orbitals.

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Assertion :The maximum oxidation state of chromium in its compounds is +6 Reason: Chromium has only six electrons in ns and (n−1)d orbitals

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionSince Chromium Cr has an electronic configuration of [Ar]3d54s1,its maximum oxidation state can be +6,reason being it has only six electrons in (n−1)d and ns orbitals.

Assertion :The maximum oxidation state of chromium in its compounds is +6 Reason: Chromium has only six electrons in $n s$ and $(n - 1) d$ orbitals