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Regarding CrO5 (chromium pentoxide), which of the following statements is/are correct? a. The oxidation number of Cr is +6. b. Four oxygen atoms in the molecule are involved in peroxide linkage. c. Only one oxygen atom has oxidation number -2.

1. All are correct
2. b and c are correct
3. a and c are correct
4. Only b is correct

Correct answer: All are correct

Solution

CrO5 (chromium pentoxide or chromium peroxide): structure has one Cr=O group (oxygen ON = -2) and two peroxide groups (-O-O-) where each O has ON = -1. So there are 4 peroxide oxygen atoms (from two O-O groups) and 1 terminal oxygen. Total oxygen count: 5 = 4+1 (correct). ON check: Cr + 1*(-2) + 4*(-1) = 0 => Cr = +6. So: a is correct (Cr = +6); b is correct (4 oxygens in peroxide linkage); c is correct (only 1 oxygen has ON = -2). All statements correct.

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