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Question

IDENTIFY THE REDUCED AND OXIDISED SPECIES IN THE FOLLOWING REACTIONS. GIVE REASONS FOR IDENTIFICATION. ALSO MENTION THE REDUCING AND OXIDISING AGENTS-
  • H2S[g] +CI2[g] - 2HCl[g]+S[s]
  • 4Na[s]+O2[g] - 2NA2O[s]
  • Cu[s]+I2[g] - CuI2[g]
  • Fe2O3[s]+3Co[g] - 2Fe[s] +3CO2[g]
  • 2Al[s]+6HCl[aq] - 2AlCl3[aq]+3H2[g]

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Solution

1. H2S +CI2 2HCl+SH2S undergoes oxidation as there is removal of hydrogen.Cl2 undergoes reduction as there is addition of hydrogen.So H2S is the reducing agent (the one undergoes oxidation) and Cl2 is an oxidising agent (the one undergoes reduction)2. 4Na+O2 2Na2OSodium undergoes oxidation as there is addition of oxygen. So its a reducing agent. O2 undergoes reduction and acts as an oxidising agent.3. Cu +I2 CuI2The oxidation number of copper in the LHS = 0 and RHS = +2.There is increase in oxidation number means oxidation. So copper acts as a reducing agent. I2 the oxidation state = 0 and in right side its =-1. So it undergoes reduction. That means it acts as reducing agent.Like this your try for the rest.

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