Question

what is the effect of sulphuric acid on red litmus paper

Answer 1

it remains red as the sulphuric acid is acidic in nature and blue litmus paper would have turned red if used. Here it is used red so no change in colour in litmus paper.

Answer 2

no effect........ B'cuz the sulphuric acid is an acid........ acid change blue litmus to red..... but they have no effect on red litmus......!!!