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 ______.
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