Answer :

nivasuhas
we can test it with the help of litmus paper(blue or red).
if  it is basic it red to blue.
if it is acid it turns blue to red.
Garvita
We can test nature of a substance by red and blue litmus paper . if the solution is acidic the blue litmus paper turned into red and red litmus remains constant . if the the solution is basic in nature the red litmus paper turned into blue and blue litmus paper remains constant

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