please will you help me with some question

label Chemistry
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Match the appropriate oxidation number to the element in red

 (NH4)2SO4 
 O3 
 PO33- 
 SOBr2 
 HSO4
Nov 6th, 2014

(NH4)2SO4 = +6
 O3 = 0
 PO33- =+3
 SOBr2 =+4
 HSO4=+6

PLEASE BEST MY ANSWER. WELCOME

Nov 6th, 2014

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Nov 6th, 2014
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Nov 6th, 2014
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