Saturday, May 30, 2015

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

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