The element chromium (Cr) has its oxidation number in K2Cr2O7:

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Question:The element chromium (Cr) has its oxidation number in K2Cr2O7:

1. + 6 

2. - 2 

3.+ 7 

4.-7

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  1. The element chromium (Cr) has its oxidation number in K2Cr2O7:
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