Determine the oxidation states of the elements in the following compounds: NO2, Al (OH) 3, H3PO4, Ba (NO3) 2.

NO2 – N [+4] O [-2],

Al (OH) 3 – Al [+3] O [-2] H [+1],

H3PO4 – H [+1] P [+5] O [-2],

Ba (NO3) 2 – Ba [+2] N [+5] O [-2]



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