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  • What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.

What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.

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Answer:

(i) Dry HCl gas: No change on litmus paper

(ii) Moistened NH_{3} gas (basic): Red litmus will turn blue.

(iii) Lemon Juice (contains citric acid): Blue litmus will turn red.

(iv) Carbonated soft drinks (contains carbonic acid): Blue litmus will turn red.

(v) Curd (contains lactic acid): Blue litmus will turn red.

(vi) Soap solution (basic): Red litmus will turn blue.

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