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Q.

Which one of the following is a characteristics of bases ?

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a

Blue litmus changes to red

b

To evolve hydrogen gas when react with all metals

c

Sour in taste

d

Red litmus changes to blue

answer is B.

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Detailed Solution

Red litmus contains a weak di protic acid, when it is exposed to a basic compound, the hydrogen ions react with the added basic compound. The conjugate base formed from the litmus acid, has a blue colour.
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