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2C(s)  + O2(g) 2CO(g) 
2 H2S(g) + SO2 (g)  3 S (s) + 2H2O(g) 
4Fe(s) + 3O2(g)2Fe2O3(s) 
CO(g) + 3H2(g)  CH3 OH(l)
ANS : 2
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