assign oxidation numbers to all the atoms present in
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mn +3
Al +4
....
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Al +4
....
............
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1...Mn2O3
2x+3(-2)=0
2x=6
x=3
2...Al(OH)4
x+4(-2)+4(1)=0
x=4
3...KAuCl4
+1+x+4(-1)=0
x=3
2x+3(-2)=0
2x=6
x=3
2...Al(OH)4
x+4(-2)+4(1)=0
x=4
3...KAuCl4
+1+x+4(-1)=0
x=3
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