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](https://tex.z-dn.net/?f=Cl_2%2B2OH%5E-%5Crightarrow%20Cl%5E-%2BClO%5E-%2BH_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^+](https://tex.z-dn.net/?f=NH_3%2BH%5E%2B%5Crightarrow%20NH_4%5E%2B)
This reaction a an acid-base reaction in which
is a base and
is an acid react to give
as a salt.
(d) ![4Fe+3O_2\rightarrow 2Fe_2O_3](https://tex.z-dn.net/?f=4Fe%2B3O_2%5Crightarrow%202Fe_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](https://tex.z-dn.net/?f=Ca%2BF_2%5Crightarrow%20CaF_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.