Question

the pH values of four solution are 3,5,10,12.
mixing combination of these solutions can give a solution of pH 6 which combination of solutions could NOT do this
3,10
3,12
5,10
10,12

Answer 1

10,12 cannot do this as both are basic. so solution will remain basic when mixed together. so ph will be above 7.all others are combination of acid and base

Answer 2

Answer is 10,12 as both are base so it can combine and have ph 6

Hope you get the help buddy .