NCERT Class VIII Science Solutions: Chapter 14-Chemical Effects of Electric Current Part 2

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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

Image of what is electroplating

Image of What is Electroplating

Image of 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 experment

Sugar Solution in Diluted Water in Experment

As showing in fig is a Sugar solution in diluted water in experment

  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.