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Find the oxidation number of the elements in the following compounds, 1. C in CO2

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Find the oxidation number of the elements in the following compounds,

1. C in CO2 

2. Mn in MnSO4 

3. N in HNO3

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1. Oxidation number of C in CO2 is +4 

2. Oxidation number of Mn in MnSO4 is +2 

3. Oxidation number of N in HNO3 is +5

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