Question

H₂S + Cl₂ gives s + cl^- in acid medium
Balance by ion election method.

Answer 1

Answer:

ce the chemical equation by the oxidation number method. <br> (vi) `FeCl_(3) + H_(2)S to FeCl_(2) + S + HCl `

Answer 2

The unbalanced chemical equation is:

MnO
4
−
​
(aq)+SO
2
​
(g)→Mn
2+
(aq)+HSO
4
−
​
(aq)

The oxidation half reaction is

SO
2
​
(g)+2H
2
​
O(l)→HSO
4
−
​
(aq)+3H
+
(aq)+2e
−
(aq).

The reduction half reaction is

MnO
4
−
​
(aq)→Mn
(
2+)(aq).

In the reduction half reaction, the oxidation number of Mn changes from +7 to +2. Hence, 5 electrons are added to LHS of the reaction.

MnO
4
−
​
(aq)+5e
−
→Mn
2+
(aq)

Charge is balanced in the reduction half reaction by adding 8 hydrogen ions to LHS.

MnO
4
−
​
(aq)+5e
−
+8H
+
(aq)→Mn
2+
(aq)

To balance O atoms, 4 water molecules are added on RHS.

MnO
4
−
​
(aq)+5e
−
+8H
+
(aq)→Mn
2+
(aq)+4H
2
​
O(l)

To equalize the number of electrons, the oxidation half reaction is multiplied by 5 and the reduction half reaction is multiplied by 2.

5SO
2
​
(g)+10H
2
​
O(l)→5HSO
4
−
​
(aq)+15H
+
(aq)+10e
−
(aq)

2MnO
4
−
​
(aq)+10e
−
+16H
+
(aq)→2Mn
2+
(aq)

Two half cell reactions are added to obtain a balanced equation.

2MnO
4
−
​
(aq)+5SO
2
​
(g)+2H
2
​
O(l)→2Mn
2+
(aq)+5HSO
4
−
​
(aq)