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SAI INTERNATIONAL SCHOOL

CLASS - VIII

Subject – CHEMISTRY

Chapter – CHEMICAL EFFECTS OF ELECTRIC CURRENT

TOPIC – Electrodes and its Types, Ions and it Types, Electrolytes and its
Types, Electric Circuit, Conductors and Conduction of
electricity in liquids

PRACTICE WORKSHEET

Q. Questions Mark Skill
No.
Choose the correct option from the following for Questions 1, 2
and 3:
a) If both Assertion and Reason are correct and Reason is the
correct explanation of Assertion.
b) If both Assertion and Reason are correct, but Reason is not
the correct explanation of Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If Assertion is incorrect but Reason is correct.
e) If Assertion & Reason both are incorrect.
1. Assertion (A): The positively charged electrode is called anode. 1 U
Reason (R):The negatively charged electrode is called cathode.
2. Assertion (A): If a little salt is dissolved to the distilled water, it 1 U
becomes good conductor of electricity.
Reason (R):On adding salt, the distilled water solution becomes a
conducting liquid, as it can now dissociate the ions.
3. Assertion (A):Complete dissociation of ions take place in case of 1 U
strong electrolyte.
Reason (R):A liquid which cannot conduct electricity is called
electrolyte.
4. Which of the following energy conversions takes place in a 1 K
battery?
a) Electrical energy into chemical energy.
b) Chemical energy into electrical energy.
c) Magnetic energy into electrical energy.
d) Electrical energy into mechanical energy.
5. Give one example of a strong electrolyte and a weak electrolyte. 1 C
6. Show with the help of a diagram that lemon juice and vinegar are 3 U&A
good conductors of electricity.
7. a) Give an example of chemical effect of the electric current. 3 A
b) Which effect of current causes the bulb to glow? (2+1)
8. Do distilled water conduct electricity? What will happen if we add 3 C
sugar to it and then salt to it? Explain.

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