Question

Which statement would indicate the presence of an acid?
It tastes bitter..
It does not react with active metals.
It reacts with active metals to form a gas.
It does not change the color of litmus paper

Answer 1

"It reacts with active metals to form a gas."

Explanation: Acids react with many active metals (e.g., Zn, Mg) to produce hydrogen gas: 2HCl + Zn → ZnCl2 + H2. Acids taste sour and turn blue litmus red (they do not taste bitter).