Fill in the blanks

(A)

1. An electric generator converts ____________into electrical energy.

2. In India, the frequency of AC is ____________.

3. Magnetic effect of electric current was discovered by ____________.

4. Magnetic lines of force are ____________ where the magnetic field is strong.

5. A____________ is an instrument used to detect the presence of a current in a circuit.

6. An electric motor converts electrical energy into____________.

Answer:

1. mechanical energy      2. 50 Hz          3. Oersted       4. crowded.

5. galvanometer           6. mechanical energy.

(B)

1. Most of the acidic substances are _____________ in taste.

2. Phenolphthalein is _____________ type of indicator.

3. The strength of basic substance is represented by _____________.

4. p^H scale ranges between _____________ & _____________.

5. Acids & bases neutralize each other to form _____________ &_____________.

6. Sodium or potassium salt of higher fatty acids are termed _____________.

7. In FeSO₄.7H₂O, H₂O represents _____________.

8. 10% solution of NaCl is known as _____________.

9. If the p^H is less than 7, then the solution is _____________.

10. If the p^H is greater than 7, then the solution is _____________.

11. Eosin is _____________ type of indicator.

12. In Na₂CO₃ .10 H₂O, H₂O represents _____________.

13. _____________ helps to reduce acidity in stomoch.

14. _____________ is useful in preparation of organic solvent chloroform.

15. _____________ is useful in manufacturing detergent powder.

16. Base that dissolve. In water are called _____________.

17. Impure sodium chloride is brown in colour & is known as _____________.

18. _____________ is the ingredient of baking powder.

19. The chemical name of washing soda is _____________.

20. The human body works within p^H range of _____________ to _____________.

Ans. 1. sour     2. synthetic      3. p^OH        4. O, 14         5. salt, water                6. soap

       7. water of crystallization       8. brine            9. acidic           10. alkaline      

      11. synthetic      12. water of Crystallization    13. sodium bicarbonate 

      14. bleaching powder   15. washing soda         16. alkalies      17. rock salt     

      18. sodium bicarbonate  19. sodium carbonate           20. 7.35, 7.45.

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