Answer :
(a) This is a redox reaction.
(c) This is an acid-base reaction.
(d) This is a redox reaction.
(e) This is a redox reaction.
Explanation :
Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.
- Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
- Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
Acid-base reaction : It is defined as the reaction in which an acid and base react to give salt and water as a product.
Precipitation reaction : It is defined as the reaction in which an insoluble salt formed when two aqueous solutions are combined. The insoluble salt that settle down in the solution is known an precipitate.
(a) \(Cl_2+2OH^-\rightarrow Cl^-+ClO^-+H_2O\)
This reaction is a redox reaction in which the oxidation state of Cl changes from (0) to (-1) and shows reduction and the oxidation state of Cl changes from (0) to (+1) and shows oxidation.
(c) \(NH_3+H^+\rightarrow NH_4^+\)
This reaction a an acid-base reaction in which \(NH_3\) is a base and \(H^+\) is an acid react to give \(NH_4^+\) as a salt.
(d) \(4Fe+3O_2\rightarrow 2Fe_2O_3\)
This reaction is a redox reaction in which the oxidation state of Fe changes from (0) to (+3) and shows oxidation and the oxidation state of O changes from (0) to (-2) and shows reduction.
(e) \(Ca+F_2\rightarrow CaF_2\)
This reaction is a redox reaction in which the oxidation state of Ca changes from (0) to (+2) and shows oxidation and the oxidation state of F changes from (0) to (-1) and shows reduction.
