Acidic, Basic and Neutral

Ishita says anything that tastes sour must be acidic, because sourness is exactly how you recognise an acid. Her friend says taste alone cannot tell you for sure. Who is right?

Rohan says you should never touch any acid, because all acids burn you. His sister says this is not true of every acid. Who is right?

Rohit dips both red and blue litmus paper into a salt solution, and neither changes colour at all. He says this means the litmus paper must be faulty. His sister says no colour change is itself an answer. Who is right?

Priya says if you mix any acid and any base in any amounts, the result will always be exactly neutral. Her teacher says it depends on the amounts. Who is right?

When people have stomach acidity, they take an antacid tablet and feel relief. Vivaan says the antacid must contain some extra acid, which matches the stomach's acidity and calms it, like fighting fire with fire. Is Vivaan's reasoning right?

Learning that acids can be dangerous, Divya says bases must be safe, since they are the opposite of acids. Her father says strong bases are just as dangerous. Who is right?