Question 2 :
_________ plating is done on objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims because of its shiny appearance
Question 3 :
When copper rod donates electrons to hydrogen ions, it gains ______ charge.
Question 5 :
Chromium plating is done to make the object scratch proof and appear shiny.
Question 6 :
Which of the following gas is formed at the electrode connected to the negative terminal of the battery?
Question 9 :
In charging a battery of motor car, which of the following effect of electric current is used?
Question 10 :
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 11 :
Consider the following statements.<br>An ordinary light bulb has a rather short life because the<br>$1$. Filament wire is not uniform.<br>$2$. Bulb cannot be evacuated completely.<br>$3$. Wires supporting the filament melt at high temperatures.<br>Which of the given statements are correct?<br>
Question 12 :
Electroplating is a very useful process widely used in industry for coating metal objects with a thin layer of :
Question 14 :
Which of the following metal is used in electroplating, in order to bring a shine to the objects?
Question 15 :
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates<br>
Question 17 :
The electrical process of coating an inexpensive conductor with a metal is called electroplating.
Question 20 :
The process of depositing a thin layer of desired metal over another metal by passing an electric current through some electrolyte is called :
Question 21 :
When $1F$ of electricity is passed through acidulated water, ${O}_{2}$ evolved is:
Question 22 :
Tin cans used for storing food, are made by electroplating tin onto :
Question 23 :
Water obtained from which of the following sources is a good conductor of electricity?
Question 24 :
A coating of zinc is deposited on iron to protect it from __________.
Question 25 :
Boojhos uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory<br>
Question 27 :
The passage of an electric current through a conducting solution causes :
Question 29 :
The greenish blue colour spot on the potato is useful in identifying :
Question 30 :
The process of depositing thin layer of a metal over an another metal with a help of electric current is called :
Question 32 :
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 35 :
One of the most common applications of chemical effect of electric current is ______________.<br>
Question 36 :
Consider the following statements about electroplating:<br>I. Electroplating is the coating of metal objects with a thin layer of a different metal.<br>II. Electroplating makes objects look more attractive and protects them from corrosion and rusting.<br>III. Electroplating forms and envelops around the object to protect them from magnetism.<br>Which of the above statements is true ?
Question 37 :
Of the following, the one that does not make use of chemical effect of electric current is :
Question 38 :
When electric current passes through the filaments of a bulb, it starts emitting light due to :
Question 39 :
When electric current is passed through water, hydrogen is deposited over :
Question 41 :
The best conductor of electricity is a 0.1 M solution of :<br/>
Question 43 :
Why does the bulb glow, when the electric current passes through it?
Question 47 :
How long (in hours) must a current of $5.0$ A be maintained to electroplate $60$ g of calcium from molten $CaCl_2$?
Question 48 :
The process of depositing a thin layer of desired metal on another metal by means of electricity is called :
Question 50 :
What happens when the current passing through the circuit is too weak?
Question 53 :
How much current should be passed though acidified water for 100 s to liberate 0.224 litre of$H_{2}$<br>
Question 54 :
Which of the following statement is correct while conduction of electricity in lemon juice?
