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.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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, Cr(VI) in the form of dichromate is a strong oxidizing agent where MoO3 and WO3 are not because:
1) Mo(VI) and W(VI) are more stable than Cr(VI)
2) Higher oxidation states of heavier members of group-6 of transition series are more stable.