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18 questions
Choose all the inert electrodes:
iron
nickel
graphite
platinum
The electrolytic deposition of a superior metal on a baser metal is:
electro-refining
electro-plating
electro-metallurgy
electrolysis
Which of the following are strong electrolytes?
NH4OH
HBr
HI
Mg(OH)2
In the process of electrolysis, the ions are discharged as ______ _____ at the respective electrodes.
Ions discharged in electrolysis depends on the factor:
relative electrode potential
concentration of ions
relative electrode charge
density of electrolyte
The passage of electricity through an electrolyte causes the metallic ions to migrate towards the _______ and the non-metallic ions to migrate towards the _______. (use and in between to separate the answers)
Which is the correct electrochemical series?
Na, Al, Fe, Mg, Zn
Mg, Fe, Zn, Na, Al
Na, Mg, Al, Zn, Fe
Fe, Zn, Na, Mg, Al
The preferential discharge of ions present in an electrolyte at the respective electrodes is also known as: (type all in lowercase)
Choose all the correct reasons for electroplating:
Improves the electrical conductivity of the article.
Prevents corrosion or rusting of the base metal.
Makes the article dull.
Makes the article attractive.
During electroplating an article with silver, the electrolyte used is:
silver nitrate solution
silver cyanide solution
sodium argentocyanide solution
nickel sulphate solution
Which pair of electrolytes is not inert?
mercury and carbon
mercury and sodium
silver and carbon
copper and silver
Cations are negatively charged ions.
True
False
The blue colour of aq. Copper[II] sulphate solution ________ during electrolysis of aq. CuSO4 using copper electrodes, but ______ when platinum electrodes are used.
remains unchanged ; fades
remains unchanged; remains unchanged
fades ; fades
None of the above
The particles in weak electrolytes are:
molecules only
ions and unionised molecules
ions only
All of the above
The anode is the _______ electrode while the cathode is the ______ electrode. (use and in between to separate the answer)
Which metal is used in electroplating cans to store food?
nickel
tin
chromium
silver
The preferential discharge of the ions depends on its position in the ____________ series.
_____ ____ are essential for conducting electricity. (type all in lowercase)
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