Acids Bases and Salts.

Class : 7                                                Worksheet 

            Fill in the blanks :

1. Spinach contains_____________ acid while tamarind contains ________________ acid.

2. The gas which escapes out from many aerated soft drink is _____________

3. Carbon burns in air to form _______________

4. The chemical name of lime water is ______________

5. _______________ is the reaction between an acid and base.

6. An aqueous solution of sodium oxide changes ________________ litmus to blue.

7. Phenolphthalein indicator turns acidic solutions to ______________ and basic solutions to _____________.

8. The chemical name of moist baking soda is _____________

9. Calamine solution contains __________________( a base ).

10.Litmus is obtained from the _____________________

11.Curd contains __________ while vinegar contains ___________

Complete the following word equations :

1. Zinc + hydrochloric acid ___________+ _____________

2. Sodium hydroxide + Hydrochloric acid ___________+ ________

3. Calcium hydroxide + sulphuric acid _____________+ ________

True or False :

1. All acids turn blue litmus red. True / False

2. Neutral solution can change the colour of litmus. True / False

3. Orange juice turns blue litmus red. True / False

4. Substances which are neither acidic nor basic are called neutral. True/ False

5. An acid and a base neutralize each other and from a salt. True / False.

6. China rose indicator turns acidic solution to green. True / False

Acids, Bases and Salts Quiz CBSE/Science/Class7

§  1. Which is not a property of acids? A)Acids turn blue litmus red. B)Acids do not change the colour of turmeric indicator. C)These are sour to taste. D)Acids turn red litmus blue. E) With china rose indicator, these give dark pink colour. §  2. Which is not a property of bases? A)Bases turn the colour of turmeric indicator to red. B)Bases do not change the colour of blue litmus. C)Bases do not change the colour of red litmus. D)These are bitter to taste. E) Bases give green colour with china rose indicator. §  3. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? A)None of the above B)Basic C)Neutral D) Acidic §  4. Name the source from which litmus solution is obtained. A)Lichen B) Fungus C )Acid D)Base §  5. Is the distilled water acidic/basic/neutral? A)Acidic B)Basic C)Neutral  D) None of the above. §  6. Nitric acid turns red litmus blue. A)Acidic  above B)Basic False §  7. Sodium hydroxide turns blue litmus red. A)Basic B)Acidic C) None of the above 8. Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.    Water.    True/false   9. Indicator is a substance which shows different colours in acidic and basic solutions. Yes/No §  10. Tooth decay is caused by the presence of a -------- §  11. An antacid tablet contains-------------- §  12. Milk of magnesia contains-------------------. §  13. Calamine solution is applied on the skin when an ant bites. It is-------------   in nature. §  14. Factory wastes contain---------------. §  15. Sodium hydroxide is a/an----------------.