11. A student tested the ph of distilled water and found that the colour of the ph paper changed it to green. He checked the ph again after dissolving common salt in it. the color of the ph paper this time is
12. A student tested the pH of distilled water using paper and observed green colour. After adding a few drops of dilute NaOH solution, the pH was tested again. The colour change now observed would be
13. As the ph increases
14. Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively will be
15. If the ph of a solution is 7.5, its nature is
16. In an acid solution, the pH is
17. On putting two drops of dilute hydrochloric acid on the pH paper, the colour developed on the pH paper is
18. ph of a neutral solution
19. pH paper is prepared by dipping the strip into
20. ph value of lime water is
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