Question

Balance the following equations by the oxidation no. Method: Fe2+ + H+ +Cr2O7-2 → Cr3+ +Fe3+ +H20

Answer 1

Explanation:

Refer to the attachment

Additional information :-

For balance the equation by using oxidation number method steps are :-

Step 1 :-

• Calculate the oxidation number of all compound or element present in the reaction.

Step 2 :-

• See that which compound or element is oxidising or reducing.

Step 3 :-

• Give the number by which the compound or element is oxidising or reducing.

Step 4 :-

• Make the both number equal by multiplying some digit, if required.

Step 5 :-

• If Oxygen is more in reactant side or product side then add water where oxygen is less.

Step 6 :-

• Add H+ ion opposite to where water is added.

Note :-

➳If 1 molecule of water is added in reactant side then, 2 H+ ion should be added in product side.

➳If 2 molecule of water is added in product side then, 4H+ ion should be added in reactant side.

Step 7 :-

• Check the number of charge in both reactant side and product side. (If charge is equal in reactant side and product side then your answer is correct).