Findvalencyoftheunderlinedelement. (3) i)P2O3 ii)SO2 iii)NH3
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Explanation:
Equivalent masses of NH
3
in the reactions are :
(i) 4NH
3
+5O
2
⟶4NO+6H
2
O
(ii) 2NH
3
⟶N
2
+3H
2
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