What will be the action of the following substances on litmus paper? Dry HCl gas, moistened `NH_(3)` gas, lemon juice, carbonated soft drink, curd, soap solution.

Explanation

(i) Dry HCI gas No change on litmus paper
(ii) Moistened `NH_(3)` gas(base) Red litmus will turn blue.
(iii) Lemon Juice (Contains citric acid) Blue litmus will turn red.
(iv) Carbonated soft drinks (contains carbonic aid ) Blue litmus will turn red.
(v) Curd (contains lactic acid ) Blue litmus will turn red.
(vi) Soap solution (basic) red litmus will trun blue.