what is litmus paper , indicator, its just paper , its an acid , Which one of the following is acidic?, milk, tomato, citrus fruits , all of these , Which one of the following will turn red litmus blue?, a) Vinegar , (b) Baking soda solutio, c) Lemon juice, (d) Soft drinks, Which of the following strongest acid ?, sulphuric acid, carbonic , vinegar , methanoic , Name a substance which is used to cure the discomfort caused by indigestion due to over eating., milk of magnesia, Hcl , sulphuric acid .

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