Question

Classify the following reactions as either redox, acid-base, or precipitation. a) (Cl2) + (2OH-) --> (Cl-) + (ClO-) + (H2O). b) already got. c) (NH3) + (H+) --> (NH4+). d) (4Fe) + (3O2) --> (2Fe2O3). e) (Ca) + (F2) --> (CaF2)

Answer 1

(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.

Answer 2

The answers to the question are presented below by letter.
a.) redox reaction - Cl2 is reduced and OH- is oxidized
b.)
c.) acid - base reaction
d.) redox reaction - Fe is oxidized and O2 is reduced
e.) redox reaction - Ca is oxidized and F2 is reduced