Chemical Effects of Electric Current Worksheet-3

Chemical Effects of Electric Current Worksheet-3

1. When current is passed through molten sodium chloride:

(a) sodium is deposited at the positive electrode and chlorine gas is formed at the negative electrode

(b) sodium is evaporated and chloride ions are formed at the negative electrode

(c) sodium is deposited at the positive electrode and chlorine is deposited at the negative electrode

(d) sodium is deposited at the negative electrode and the chlorine gas is formed at the positive electrode

2. Splitting a compound using electricity is called:

(a) Electrolysis                              (b) Electrolyte

(c) Electrokinesis                         (d) none of these

3. A bulb in an electric circuit glows due to:

(a) magnetic effect of current   (b) heating effect of current

(c) chemical effect                       (d) conduction of current

4. LEDs are extensively used to replace bulbs because:

(a) it consumes less electricity  (b) have longer life

(c) has more power                      (d) all of these

5. Which of the following is a good conductor of electricity?

(a) tap water                                  (b) distilled water

(c) sea water                                  (d) rain water

6. A compass placed in an electric field will be deflected due to:

(a) heating effect of current

(b) magnetic effect of current

(c) conducting effect

(d) resistance of the needle to the electric field

7. The most common industrial application of chemical effects of electric current is:

(a) electroplating                          (b) Galvanising

(c) Anodising                                 (d) electrolysis

8. The process of depositing a layer of any desired metal on another material by passing electric current is called:

(a) Electrolysis                              (b) Electroplating

(c) chromium plating                  (d) galvanising

9. Tin cans, used for storing food are made by electroplating:

(a) chrome onto tin                      (b) iron on to tin

(c) tin onto iron                             (d) chrome onto iron

10. To protect iron from corrosion and rust, it is coated by:

(a) Tin                (b) Copper         (c) Zinc              (d) Mercury

Answer Key:

(1)-(d); (2)-(a); (3)-(b); (4)-(d); (5)-(c); (6)-(b); (7)-(a); (8)-(b); (9)-(c); (10)-(c)