Question

balance the reaction by oxidation no method.
Cr2O7^2- + So3^2- -> Cr^+3 + SO4^2-​

Answer 1

Answer:

2Cr2O7^-2 + 3SO3^-2 => 4Cr^+3 + 3SO4^-2

Explanation:

We can solve by following steps:

STEP 1

Select the substance in which O.N of an atom is increasing or decreasing.

STEP 2

If increase in O.N and decrease in O.N are not equal .Then, multiply by a factor . So, increase and decrease in O.N becomes equal.

STEP 3

Balance the atom other than hydrogen and oxygen.

STEP 4

Balance oxygen atom by adding H2O molecule to the oxygen deficient side.

STEP 5

Balance hydrogen atom by adding H+ ion to the hydrogen deficient side .

For clear understanding refers to the attachment.

Answer 2

Answer:

ans.............