Question

What is the effect of an acid on slightly alkaline Blue litmus paper

Answer 1

litmus paper turns to red

Answer 2

Hey Mate

$\textbf{The acid will change the slightly alkaline blue litmus paper into red. }$

A litmus paper is an indicator which means it changes colour when it is put in a acidic or basic solution.
=>A litmus in a neutral solution is purple but it reacts with acid to change its colour into red.