Question

red litmus paper is dipped in a solution it remains red ​

Answer 1

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red litmus paper is dipped in. Acid solution it remains red

Answer 2

A litmus paper is an acid base indicator. If it turns the red paper in to blue the solution is acidic. In the above question the litmus paper is red and if it dipped in solution and it remains red it means the solution is acidic as it do not have any effect on litmus paper.