I have 3 different dish but in all there the same concentration of H2SO4(Sulfuric acid).

1) to the first dish infuse HCl gas how is affect on the pH that in the dish ?

2) to the second dish infuse N2 gas here I know because N2 is an a inert gas so there is no affect on the pH.

3)to the third dish infuse NH3 gas so here the pH is grow.

Do I correct ?
Thanks.

You don't give an answer to No1 -- the pH will get lower. Your other answers are correct. Good work.

Oh well the pH will get lower because the concentration of h3o ions will be grow yes?

Thank you.

Exactly