Test Details

Chemical Effects of Electric Current

Phy 8

Jan 15, 7:30 PM

60 minutes

Jan 15, 8:30 PM

50.0 marks

MCQ

33 questions

Shahid Hussain

Adaptive and blank

Class Details

Science &Maths

Class 8&7

Science &Maths

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Question Text

Question 1 :
Chromium plating is done to make the object scratch proof and appear shiny.

Question 2 :
Which of the following gas is formed at the electrode connected to the negative terminal of the battery?

Question 3 :
Boojhos uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

Question 6 :
The greenish blue colour spot on the potato is useful in identifying :

Question 7 :
Which one of the following scientists showed that if electrodes are immersed in water and a current was passed, bubbles of oxygen and hydrogen were produced?

Question 8 :
One of the most common applications of chemical effect of electric current is ______________.

Question 9 :
Consider the following statements. An ordinary light bulb has a rather short life because the $1$. Filament wire is not uniform. $2$. Bulb cannot be evacuated completely. $3$. Wires supporting the filament melt at high temperatures. Which of the given statements are correct?

Question 10 :
Tin cans used for storing food, are made by electroplating tin onto :

Question 11 :
The process of depositing a thin layer of desired metal over another metal by passing an electric current through some electrolyte is called :

Question 13 :
Which of the following metal is used in electroplating, in order to bring a shine to the objects?

Question 14 :
In charging a battery of motor car, which of the following effect of electric current is used?

Question 15 :
A coating of zinc is deposited on iron to protect it from __________.

Question 16 :
Water obtained from which of the following sources is a good conductor of electricity?

Question 17 :
What is${ E }_{ RP }^{ 0 }$for the reaction :${ Cu }^{ 2+ }+2e\quad \longrightarrow Cu$in the half cell${ Pt }_{ { S }^{ 2- }/CuS/Cu }$if${ E }_{ { Cu }^{ 2+ }/Cu }$is 0.34 V and${ K }_{ sp }$of $CuS={ 10 }^{ -35 }$?

Question 20 :
The electrical process of coating an inexpensive conductor with a metal is called electroplating.

Question 22 :
The solution that conducts electricity due to the presence of ions is called :

Question 24 :
In LEDs, the longer lead is connected to ................ and the shorter lead is connected to .................. .

Question 25 :
In electrolytic refining of any metal impure metal is taken as anode.

Question 29 :
The best conductor of electricity is a 0.1 M solution of :

Question 31 :
Which of the following, when dissolved in distilled water, makes it a good conductor?

Question 32 :
When the same amount of electricity is passed through solution of silver nitrate and copper sulfate, $0.4$ g copper is deposited. The amount of silver deposited is:

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