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H2S + Cl22HCl + S 
     CuSO4 + 2NH4OHCu(OH)2 +  (NH4)2 SO4   
  4HCl + MnO2 Cl2 + MnCl2 + 2H2O   
 2H2O + 2Cl24HCl + O2
ANS : 2
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