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Litmus paper is used as an indicator of acids or bases. There are two types of litmus papers present – blue and red. A blue litmus paper when dipped in acid turns red in color and remains blue in basic medium. However, a red litmus paper when dipped in a base turns blue in color and remains red in acidic medium/ solution. Hence, it can be determined whether a solution is acidic or basic with the use of litmus paper. Hence, option A is correct.
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