Answer:
(a)
Dry HCI gas has no effect on litmus.
(b) Moistened 
gas turns red litmus blue.
(c) Lemon juice turns blue litmus red.
(d) Carbonated soft drink turns blue litmus red.
(e) Curd turns blue litmus red.
(f) Soap solution turns red litmus blue.
(1/2
x 6 = 3)
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