Chemical Effects of Electric Current Worksheet-4

Chemical Effects of Electric Current Worksheet-4

1. In a cell, by convention, charge is taken to be flowing from :

(a) positive electrode to negative electrode

(b) negative electrode to positive electrode

(c) both positive electrode to negative electrode and negative electrode to positive electrode

(d) none of these

2. Metals are good conductors because:

(a) outer electrons are strongly bound to the atom

(b) outer electrons are loosely bound to the atom

(c) inner electrons are loosely bound to the atom

(d) protons can detach from the nucleus and conduct electricity

3. On electrolysis, water splits into:

(a) positively charged hydrogen ions and negatively charged oxygen ions

(b) negatively charged hydrogen ions and positively charged oxygen ions

(c) hydrogen and oxygen atoms having positive and negative charges respectively

(d) hydrogen and oxygen atoms having negative and positive charges respectively

4. In electrolysis:

(a) positive ions move toward the positive electrode and negative ions to ward the negative electrode

(b) positive ions move toward the negative electrode and negative ions toward the positive electrode

(c) both ions move toward both the electrodes in equal amounts until they are balanced

(d) none of these

5. Dilute sulphuric acid splits into:

(a) oxygen ions and hydrogen ions

(b) oxygen ions, hydrogen ions and sulphur ions

(c) hydrogen ions, oxygen ions and sulphate ions

(d) hydrogen ions and sulphate ions

6. Sulphate ions move toward:

(a) copper electrode                    (b) Battery

(c) Electrolyte                               (d) zinc electrode

7. Ammonium chloride in dry cell is:

(a) a paste                                      (b) in liquid state

(c) in solid state                            (d) in gaseous state

8. Bulb does not glow when the probs are hanged in air. The reason is:

(a) air absorbs the electricity

(b) air is a bad conductor of electricity

(c) electricity is discharged into air

(d) air disperses the electricity

9. Iron vessels are coated with tin to:

(a) give better shining                 (b) increase the strength

(c) increase weight                       (d) prevent rusting

10. The chemical reaction due to passage of electric current depends on:

(a) Electrodes                                (b) magnitude of current

(c) density of liquid                      (d) all of these

Answer Key:

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