pH scale MCQ Quiz - Multiple Choice Questions & Answers Page 2

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

1. green
2. yellow
3. red
4. blue

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

1. blue
2. green
3. red
4. orange

13. As the ph increases

1. acidic strength increases
2. basic strength increases
3. basic strength decreases
4. none of these

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

1. orange, blue
2. blue, orange
3. green, blue
4. orange, green

15. If the ph of a solution is 7.5, its nature is

1. neutral
2. strongly acidic
3. weakly acidic
4. basic

16. In an acid solution, the pH is

1. greater than p(OH)
2. less than p(OH)
3. equal to p(OH)
4. none of these

17. On putting two drops of dilute hydrochloric acid on the pH paper, the colour developed on the pH paper is

1. red
2. green
3. blue
4. violet

18. ph of a neutral solution

1. is more than 7
2. is less than 7
3. is 7
4. none of these

19. pH paper is prepared by dipping the strip into

1. Universal indicator
2. Blue litmus
3. Red litmus
4. Phenolphthalein

20. ph value of lime water is

1. 7
2. more than 7
3. less than 7
4. zero