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SAI INTERNATIONAL SCHOOL

CLASS - VIII

Subject – CHEMISTRY

Chapter – CHEMICAL EFFECTS OF ELECTRIC CURRENT

TOPIC – LED and its use, Effects of current, Electrolysis and its applications,
Electroplating and its applications, Simple Circuit Diagram for Electroplating

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): When the water falls down as rain drops, many impurities 1 U
dissolve in it.
Reason (R):The presence of chemicals and impurities makes rain water a
good conductor of electricity.
2. Assertion (A): Corrosion is a gradual destruction of metal in environment. 1 U
Reason (R):Corrosion of iron cannot be prevented by electroplating.
3. Assertion (A):A magnetic compass shows deflection when kept near an 1 U
electric wire conducting current.
Reason (R):The deflection in magnetic compass indicates electric current
flowing through the wire.
4. An electrode ‘A’ is connected to the positive terminal of a battery and 1 K
electrode ‘B’ to the negative terminal. What will be the name of electrode
‘A’ and ‘B’?
a) A is anode and B is cathode.
b) A is cathode and B is anode.
c) A is cathode and B is an electrode.
d) None of the above.
5. An electrolytic cell consists of: 1 C
(i) Positively charged cathode
(ii) Negatively charged anode
(iii) Positively charged anode
(iv) Negatively charged cathode
a) (i) and (ii)
b) (ii) and (iv)
c) (i) and (iii)

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