Fill in the blanks.
1. Soap solutions turns ………….. on adding hibiscus indicator.
2. An indicator prepared from artificialsources is known as ………….. .
3. Methyl orange turns in acids and ………….. in bases.
4. Phenolphthalein turns ………….. in bases, but ………….. in acids.
5. Substances which change their smell when mixed with acid or base are known as ………….. .
6. ………….. is a mixture of different indicators and shows different colours in different solutions.
7. ………….. can show the strength of acid or alkaline substance.
8. Strength of acid or base solution is measured in ………….. scale.
9. pH of acids is ………….. .
10. pH of bases is ………….. .
11. pH of neutral substance is ………….. .
12. Natural acids are ………….. acids.
13. Acids react with metals and release gas.
14. Acids react with ………….. and release carbon dioxide gas.
15. Reaction of an acid and a base is called ………….. reaction.
16. The substances formed in neutralization reaction are ………….. and ………….. .
17. Antacids contain ………….. .
18. When an ant bites, it injects acid into the skin.
19. When soil becomes too acidic, farmers treat it by adding
20. When soil becomes too basic, farmers treat it with
21. Rain water with slight acidic nature is called
22. ………….. acid is used in the preservation of pickles and other food substances.
23. ………….. acid is used in the production of ink and leather.
24. Base used in windows cleaner is ………….. .
25. Magnesium hydroxide is used in ………….. and ………….. .
