Choose the proper whole-number coeffi- cients for each substance to yield a balanced
equation.

D
1. 2, 1, 2
2.1, 1, 1
3. 1, 2, 1
4. 2, 1,1

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.

It decreases by 4 is your answer mark brainliest