- #1

terryds

- 392

- 13

## Homework Statement

Determine which is/are redox reaction/s ?

##1. 2HNO_2 + 2HBr \rightarrow 2NO + BR_2 + 2H_2O##

##2. PbO_2 + SO_2 \rightarrow PbO + SO_3##

##3. 2Ag + Cl_2 \rightarrow 2AgCl##

##4. SO_2 + NaOH \rightarrow NaHSO_3##

## Homework Equations

Redox reactions are the ones which involves changes in oxidation numbers

## The Attempt at a Solution

Since all reactions involves change in oxidation number

1. Br

2. Pb

3. Cl

4. S

I think all the reactions are redox.

But, the answer is just reaction 1, 2, and 3

Please tell me why reaction 4 is not redox reaction