Question

if there are therre containers one is full of acids and other is full if base how will you find that which container is acid or a base​

Answer 1

We shall use a litmus paper. We will take 2 litmus papers, with original colours red and blue. If we are testing the container filled with base, the red litmus paper will turn blue and the blue litmus paper will remain blue. If we test the container filled with acid, the blue litmus paper will turn red and the red litmus paper shall remain the same.

Note: We could obviously use other types of indicators, but here litmus paper would be the best solution.