Analyse the picture given below.
: Add few drops of phenolphthalein to the remaining soultion after electrolysis. What change will take place? Why?

Take hot water and cold water in two test tubes. Add one drop of phenolphthalein to both of the test tubes. Then add magnesium ribbon of the same size to this test tubes. a) Which test tubes shows the sudden formation of pink colour? b) What is the reason for the sudden formation of pink colour? c) Which gas is formed? d) Write the equation for the chemical reaction.

Take cold water and Hot water in two test tubes,Add one or two drops of phenolphthalein in it Drop equally sized Mg ribbon in it: Why did pink colour appear in that test tube so early?

Take 10 mL distilled water in a test tube and take the same volume of hard water in another test tube. Add a few drops of soap solution to both the test tubes and shake well. Do both the test tubes contain the same quantity of foam? Which test tube contains more foam? What do you infer?