Class 10 Chemistry - Acid, Bases and Salts (Worksheet)
Fill in the blanks with suitable words
1. An acid is a compound which when dissolved in water gives _________ ions as the only _________ ions.
2. Higher the pH value of a solution, the more __________ it is.
3. pH value of lemon juice is _________ than 7.
4. Salts of strong acids and strong bases in water produce ________ solution.
5. Solution of sodium carbonate in water is _________ in nature, while the solution of ferric chloride is ________ in nature.
6. Vinegar contains ________ acid.
7. Dissolving of aluminium foil in HCl as well as NaOH shows that it is _________ in nature.
8. Methyl orange turns __________ in acidic solution.
9. The complete reaction between an acid and a base is called ______________ .
10. HCl is considered as a _________ acid because it gets completely dissociated to liberate the H+ ions.
11. _________ gas is evolved when dil. HCl reacts with metal bicarbonate.
12. Tooth decay start when the pH of mouth is lower than ______.
13. Fresh milk has a pH of 6. When it changes into curd (yoghurt), its pH value ________.
14. The name and chemical formula of the calcium compound used for disinfecting drinking water is __________.
15. Plaster of Paris is prepared by decomposing ________ at 373K.
16. ___________ is the fixed number of water molecules present in one formula unit of a substance.
17. When a metallic oxide is dissolved in water, the solution formed has high concentration of _______ ions.
18. The salt of the sulphuric acid are called sulphates and those of the acid HNO₃ are called _________.
19. ______ is the process of decreasing the strength of an acid or base by hydrolysis.
20. The pH range our body works is _______.
Answers:
1. Hydronium or Hydrogen ion, Positive
2. alkaline / basic
3. less
4. neutral
5. basic, acid
6. acetic
7. amphoteric
8. pink
9. neutralisation
10. strong
11. Carbon Dioxide
12. 5.5
13. decreases (due to formation of more lactic acid)
14. Calcium oxychloride (CaOCl2)
15. gypsum
16. Water of crystallization
17. OH-
18. nitrates
19. Dilution
20. 7.0-7.8
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