Question

The aqueous solution of one of the following salt will turn red litmus blue is

Answer 1

A basicsalt turns red litmus to blue.
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Basic salt is combination of strong base and weak acid.

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Answer 2

Salt is produced by neutralization reaction where acid and base react to produce salt and water.

Here Aqueous solution of salt turns red litmus to Blue means it is basic in nature.
The salt is basic in nature which is formed by reaction of weak acid and a strong base.