Science
(a) Identify the reducing agent in the following reactions :
(i) 4NH3 + 5O2 ⟶ 4NO + 6H2O
(ii) H2O + F2 ⟶ HF + HOF
(iii) Fe2O3 + 3CO ⟶ 2Fe + 3CO2
(iv) 2H2 + O2 ⟶ 2H2O
(b) Define a redox reaction in terms of gain or loss of oxygen.
Chemical Reaction
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Answer
(a) The reducing agents are:
(i) Ammonia (NH3)
(ii) Water (H2O)
(iii) Carbon monoxide (CO)
(iv) Hydrogen (H2)
(b) A redox reaction is one in which one reactant gains oxygen and becomes oxidized while the other reactant loses oxygen and is reduced.
For example :
CuO + H2 ⟶ Cu + H2O
Hydrogen is oxidized to water and CuO is reduced to Cu
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