The (n-1)d shell of electron in d-block elements is expanding and, therefore they have many physical and chemical properties in common. They show variable oxidation state and all are metals. The transition element i.e., d-block element show an unparallel tendency to form coordination compound with thhose groups which are able to donate an electron pair (i.e. lewis base). Which one is most acidic?A. `Cr_(2)O_(3)`B. `V_(2)O_(5)`C. `Mn_(2)O_(7)`D. `Fe_(2)O_(5)`

The (n-1)d shell of electron in d-block elements is expanding and, the

1.	The (n-1)d shell of electron in d-block elements is expanding and, therefore they have many physical and chemical properties in common. They show variable oxidation state and all are metals. The transition element i.e., d-block element show an unparallel tendency to form coordination compound with thhose groups which are able to donate an electron pair (i.e. lewis base). Which one is most acidic?A. `Cr_(2)O_(3)`B. `V_(2)O_(5)`C. `Mn_(2)O_(7)`D. `Fe_(2)O_(5)`
Answer» Correct Answer - C As the oxidation state of metal associated with oxygen increases, the acidic character of oxide incease. So `Mn_(2)O_(7)` is most acidic as it has higest, `+7`, oxidation state.

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