Assertion : $C r (V I)$ in the form of dichromate in acidic medium is a strong oxidising agent where $M o O_{3}$ and $W O_{3}$ are not. Reason: In d-block elements higher oxidation states are favoured by heavier members.

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
In acidic medium, $C r (V I)$ in the form of dichromate is a strong oxidizing agent where ${M o O}_{3}$ and ${W O}_{3}$ are not because:

1) $M o (V I)$ and $W (V I)$ are more stable than $C r (V I)$

2) Higher oxidation states of heavier members of group-6 of transition series are more stable.

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Assertion :Cr(VI) in the form of dichromate in acidic medium is a strong oxidising agent where MoO3 and WO3 are not. Reason: In d-block elements higher oxidation states are favoured by heavier members.

Assertion : $C r (V I)$ in the form of dichromate in acidic medium is a strong oxidising agent where $M o O_{3}$ and $W O_{3}$ are not. Reason: In d-block elements higher oxidation states are favoured by heavier members.