Class 8 Science Chapter-16 Electric Current and Its Chemical Effects DAV|CBSE Book 2021

Class 8 Science Chapter-16 Electric Current and Its Chemical Effects DAV|CBSE Book 2021 

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Class 8 Science Chapter-16 : Electric Current and Its Chemical Effects 

This Post Contains All The Exercises of Chapter 16 Science Of Class 8.

• A.Fill In The Blanks

• B. State True or False for the following statements 

• C.Tick (√) The Correct Option

• D.Answer The Following Questions in Brief 

• E.Answer The Following Questions
• Value Based Question
• Something To Do

SOMETHING TO KNOW

A. Fill in the following blanks:

1. Most liquids, that conduct electricity, are solutions of acid, base and salt. 

2. The greater the concentration of an ion in the solution, the greater is the conductivity of the solution.

3. The passage of an electric current, through a solution, can cause chemical effects.

4. When electric current is passed through copper sulphate solution, copper gets deposited on the plate connected to the negative terminal of the battery. 

5. The process, in which electricity is used to deposit a thin layer of any desired

metal on another metallic object, is known as, electroplating.

6. The faster is the relative motion between the magnet and the (closed) coil, the stronger is the current that flows through the coil.

B. State true or false for the following statements: 

1. A solution of silver nitrate is a good electrolyte. 

Ans) True 

2. An electrolytic cell consists of a cathode, anode and an electrolyte.

Ans) True 

3. Oxygen gets liberated at the anode during the electrolysis of acidified water. 

Ans) True 

4. Electrorefining is the process of coating one metal on another using an electric current.

Ans) False 

5. The phenomenon of Electro-magnetic Induction' was discovered by the Italian. scientist, Alessandro Volta.

Ans) False 

C. Tick (✓) the correct option:

1. The names of four electrolytes are given below:

(A) Sea water (C) Nitric acid

(B) Tap water (D) Oxalic acid 

Out of these, the weak electrolytes are the ones labelled as

Ans) B and D

2. Electrolytes conduct electricity due to the movement of - 

Ans) Positive as well as negative ions

3. The electrode, connected to the positive terminal of a battery, is known as the - 

Ans)  Anode

4. The phenomenon of decomposition of an electrolyte, when electricity is passed

through it, is known as - 

Ans) Electrolysis

5. The process, of coating of (say) iron with chromium, is known as - 

Ans) Electroplating

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