Class 10 : Reaction with HCL Class 10 Notes | EduRev
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☆Dry HCI gas does not change the colour of the litmus paper as to change the colour we need presence of ions like hydrogen and hydronium..
☆Moistened NH3 gas turns the red litmus paper into blue due to the ammonium chloride formed..
☆Lemon juice changes blue litmus to red as it contains citric acid in it..
☆Carbonated soft drinks have CO2 in them which forms carbonate acid and turns blue litmus to red..
☆Curd is a product of milk so it contains lactic acid in it and therefore it changes blue litmus to red..
☆Soap solution is a base and therefore changes red litmus paper to blue..
Hope it helps u my frnd......