The correct answer is (a) Vinegar.
· Vinegar is an acidic substance, and acids turn blue litmus paper red. Vinegar contains acetic acid, which causes the color change in litmus paper.
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· Washing soda solution : Alkaline in nature, it turns red litmus blue.
· Limewater : Slightly basic, it turns red litmus blue.
· Baking soda solution : Mildly basic, it also turns red litmus blue.
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