NCERT Class VIII Science Solutions: Chapter 14-Chemical Effects of Electric Current Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 6:

Which of the following metals is used in electroplating to make objects appear shining?

(a) Iron

(b) Copper

(c) Chromium

(d) Aluminium

Answer: C

What is Electroplating

Question 7:

Which of the following solutions will not make the bulb in Fig glow?

As Showing in Fig is a Sugar Solution in Diluted Water in Ex …
  1. Sodium chlorides
  2. Copper sulphate
  3. Silver nitrate
  4. Sugar solution in diluted water

Answer: D

VERY SHORT ANSWER QUESTIONS

Question 8:

Fill in the blanks

  1. The object to be electroplated is taken as ________ electrode.
  2. One of the most common applications of chemical effect of electric current is ________.
  3. Small amount of a mineral salt present naturally in water makes it a________ of electricity.
  4. Electroplating of ________ is done on objects like water taps and cycle bell to give them a shiny appearance.

Answer:

  1. The object to be electroplated is taken as cathode electrode.
  2. One of the most common applications of chemical effect of electric current is conductor.
  3. Small amount of a mineral salt present naturally in water makes it a electroplating of electricity.
  4. Electroplating of chromium is done on objects like water taps and cycle bell to give them a shiny appearance.

Question 9:

Why is a layer of zinc coated over iron?

Answer:

A coating of zinc is provided to protect iron from corrosion and rust.

Question 10:

Will the solution of sugar in distilled water conduct electricity?

Answer:

No

Question 11:

Name the effect of current responsible for the glow of the bulb in an electric circuit.

Answer:

Heating effect of electric current.