Match the column 1 with column 2 Column 1 Column 2 (a) Insulator (i) Electric circuit (b) conductor (ii) Conduct current (c) closed path (iii) Prevents rusting (d) Solution of distilled water and salt (iv) Rubber (e) Electroplating (v) Copper

(a) Insulator (iv) Rubber Rubber is an insulator because it doesn't let the electricity pass through it. (b) conductor (v) Copper Copper is a conductor, due to the presence of free electrons it conducts electricity. (c) closed path (i) Electric circuit Closed path for the electric current consist of a battery and all conductors are known as an electric circuit. (d) Solution of distilled water and salt (ii) Conduct current Through this solution current will be conducted due to the presence of ions and due to dissolution of salt in water. (e) Electroplating (iii) Prevents rusting When precious metal is coated over the cheaper metal to make the latter shinier and corrosion resistant. Column 1 Column 2 (a) Insulator (iv) Rubber (b) conductor (v) Copper (c) closed path (i) Electric circuit (d) Solution of distilled water and salt (ii) Conduct current (e) Electroplating (iii) Prevents rusting

Match the column 1 with column 2 Column 1 Column 2 (a) Copper And Aluminium (i) Electrodes (b) A tester (ii) Good Conductor (c) Carbon Rod (iii) Detect the current (d) LED (iv) Added to water to increase conductivity (e) Lemon Juice (v) Light Emitting diodes

(a) Copper And Aluminium (ii) Good Conductor Copper and aluminium both are metals. Hence, the presence of free electrons is there, so they act as good conductors. (b) A tester (iii) Detect the current To detect the presence of current without using the bare hands, we use the tester. A tester contains a cell as a source of electricity, conducting wires, and a device like an LED. (c) Carbon Rod (i) Electrodes Electrodes such as anode and cathode are made up of the carbon. (d) LED (v) Light Emitting diodes LED is Light-emitting diode which can glow even a small current is flowing through it. (e) Lemon Juice (iv) Added to water to increase conductivity When lemon juice adds to the water it results in dissolution and formation of the ions in solution to make it conducting. Column 1 Column 2 (a) Copper And Aluminium (ii) Good Conductor (b) A tester (iii) Detect the current (c) Carbon Rod (i) Electrodes (d) LED (v) Light Emitting diodes (e) Lemon Juice (iv) Added to water to increase conductivity

E M B I B E

All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 7

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IMPORTANT

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Most liquids that conduct electricity are solutions of acids, bases and salts.

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Important Questions on Chemical Effects of Electric Current

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All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 8

The passage of an electric current through a conducting liquid causes a chemical reaction.

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All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 9

During electroplating, the object to be electroplated is made anode.

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All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 10

The chemical effect of current is used in purification of salts.

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All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 11

The chemical reaction brought about by an electric current may produce changes in the colour.

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All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 1

Match the column 1 with column 2

Column 1	Column 2
(a) Insulator	(i) Electric circuit
(b) conductor	(ii) Conduct current
(c) closed path	(iii) Prevents rusting
(d) Solution of distilled water and salt	(iv) Rubber
(e) Electroplating	(v) Copper

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 14 - Chemical Effects of Electric Current>Chapter Practice>Q 2

Match the column 1 with column 2

Column 1	Column 2
(a) Copper And Aluminium	(i) Electrodes
(b) A tester	(ii) Good Conductor
(c) Carbon Rod	(iii) Detect the current
(d) LED	(iv) Added to water to increase conductivity
(e) Lemon Juice	(v) Light Emitting diodes