A colourless liquid sample was tested with `pH` paper strip. The colour of the strip changed to reddish pink. The sample could be:

The colour of the pH strip turned red when it was dipped into a sample. The sample could b:

pH of a water sample is tested with

The colour of pH strip turned red when it was dipped in a sample, the sample could be

Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the trip:

On putting a few drops of an unknown liquid on the pH strip, the colour of the pH strip is changed to violet. The liquid taken is likely to be

On putting a few drops of a liquid on a pH strip, the colour of pH strip changed to green. The liquid is most probably.

A student added zinc strip to a solution of CuSO_4 . After several minutes, he observed that the blue colour of solution changed and a layer got deposited on zinc strip. The colour of the solution and that of the coating would respectively be ______

A student added zinc strip to a solution of CuSO_4 . After several minutes, he observed that the blue colour of solution changed and a layer got deposited on zinc strip. The colour of the solution and that of the coating would respectively be ______

In which of the following solutions, would the colour of pH strip change to dark blue?