4. Acid Basis and Salts

1. Acids are _________ to taste and turn blue litmus to red.

2. Bases are ________ to taste, ________ to touch and turn red litmus to blue.

3. Methyl orange and phenolphthalein are the examples of ______________.

4. Litmus solution is a dye extracted from ________ tree.

5. Lichen is a plant belonging to the division of ___________ and is used as indicator.

6. There are some substances whose odour changes in acidic or basic media. These are called ___________ indicators.

7. Examples of olfactory indicators are ______________ and _______ oil.

8. Acid + metal → Salt + __________ gas.

9. Metal carbonate + acid → salt + ___________ + water.

10. Metal hydrogen carbonate + acid → salt + _________ + water.

11. Pickles and sour substances are not stored in ________ and _______ vessels.

12. The reaction of an acid with a base to give a salt and water is known as a _______________ reaction.

13. Base + Acid → _______ + Water.

14. On dissolving bases in water produces _________ ions.

15. Bases which are soluble in water are called _________.

16. Metallic oxides and metallic _________ are basic in nature.

17. Non-metallic oxides are _________ in nature.

18. Acid produces the _____ or ______ ions in aquous solutions.

19. Basis produces te _______ ions in aquous solutions.

20. The process of dissolving an acid or a base in water is an ___________ process.

21. _________ is a strong base and dil. ______ is a weak base.

22. _____ is a strong acid and ___________ is a weak base.

23. Universal indicator is a mixture of ______________.

24. A scale for measuring hydrogen ion concentration in a solution is called ______ scale.

25. The pH of neutral solutions is ______.