CBSE Class 10 - Science - CH2 - Acids, Bases and Salts (Worksheet)

Acids, Bases and Salts

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Worksheet

Fill in the Blanks

1. Blue litmus changes into red colour in the presence of_______.

2. The acid present in lemon juice is _______.

3. Red litmus changes into blue colour in the presence of ______.

4. The chemical name of Plaster of Paris is ___________ and its chemical formula is ____________.

5. Methyl orange gives __________ in basic medium while phenolphthalein gives _______.

6. Example for strong acid is ________.

7. Example for weak acid is ________

8. Example for strong base is_______.

9. Example for weak base is ____________


10. The chemical name of washing soda is __________, Its chemical formula is ___________. It is used for removing ________ __________ of water.

11. The negative logarithm of H⁺ ion concentration is defined as the _____

12. If a solution has pH < 7, then the solution is_________.

13. If a solution has pH > 7, then the solution is ___________

14. If a solution has pH = 7, then the solution is _________

15. The concentration of hydronium ions (H₃O+) ___________(increase/decreases) per unit volume on diluting an acid.

16. Acids react with bases to form _________

17. Egg-shells are made up of ___________

18. Enamel of teeth is the hardest substance but it decays when the pH of mouth is less than ______.

19. The term pH is introduced by _______

Answers:
1. acids
2. citric acid
3. Base
4. calcium sulphate hemihydrate, CaSO₄.1/2H₂O.
5. yellow colour, pink colour
6. Hydrochloric Acid (HCl)
7. Acetic Acid (CH₃COOH)
8. Sodium Hydroxiade(NaOH)
9. Ammonium Hydroxide (NH₄OH)
10. sodium carbonate, —Na₂CO₃.10H₂O, permanent hardness
11. PH
12. Acid
13. Base
14. Neutral
15. decreases
16. Salt and Water
17. Calcium Carbonate
18. 5.5
19. Sorenson