Question

which of the following will not turn blue litmus red
(a) vinegar (b)dry HCl has
(c) dilute hydrochloric acid
(d) lemon juice
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Answer 1

Answer:

a) vinegar

Explanation:

Vinegar is basic ( alkaline ) in nature so it will not turn blue litmus to red.

Answer 2

all of the above are acids and blue litmus turns red in the presence of acid