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Question

Select the correct statements among the following.
I) V2O5 and Cr2O3 are amphoteric oxides.
II) Interstitial compounds of transition elements have an exact formulae.
III) In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.

A
I, II
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B
II, III
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C
I, III
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D
I, II, III
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Solution

The correct option is C I, III
I) V2O5 and Cr2O3 are amphoteric oxides.
Transition metal oxides in their lower oxidation state are basic in nature.
In intermediate oxidation states, they are amphoteric in nature.
In higher oxidation state, they are acidic in nature.
II) Interstitial compounds of transition elements do not have an exact formulae as they are non-stoichiometric compounds.
III) In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
For example, Mn2O7 is stable. In higher oxidation state, transition metals only form fluorides as F is more electronegative.
Thus, only statements I and III are correct.

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