Which of the following is an acid?, Soap, Vinegar, Baking soda, Toothpaste, What color does blue litmus paper turn in an acid?, Green, Yellow, Blue, Red, Which pH value represents an acidic substance?, 2, 7, 8, 12, Which of the following is a common property of acids?, They feel slippery., They turn red litmus paper blue., They have a pH less than 7., They are always purple., Which acid is found in lemons?, Hydrochloric Acid, Sulphuric Acid, Citric Acid, Nitric Acid.

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