What is selective discharge of ions? Name one factor affecting it.
The preferential discharge of ions present in an electrolyte at the respective electrodes is known as selective discharge of ions. Position, Conc, Electrodes
Mention any two differences between metallic and electrolytic conduction.
To be discussed
State the entire electro-chemical series of metals in proper order.
K, Ca, Na, Mg, Al, Zn, Fe, Pb, [H], Cu, Hg, Ag
___________ takes place in covalent compounds. [dissociation / ionization]
Ionisation
What is electrolytic dissociation?
The process due to which an ionic compound in the fused state or in aqueous solution state dissociates into ions by passage of electric current through it.
Name the electrolyte used in electroplating of silver. Why it is used? How is it prepared?
To be discussed
What is meant by the degree of dissociation?
It is the extent to which an electrolyte breaks up into ions
Mention any two conditions for electroplating [with reasons]
To be discussed
Which is the negative electrode? Which ions migrate to it?
Cathode, Cation
Which metals do not require electro-refning?
Metals that are extracted by electrolysis
Why are articles electroplated? [two reasons]
To prevent corrosion and to make them attractive
Metals which ionize most readily are at the ________ of the series. [top / bottom]
top
Electrolytic cell is also called ________.
voltameter
Name the electrode that diminishes during electroplating.
Anode
Name the products at cathode and anode during the electrolysis of conc. NaCl solution.
Cathode - Hydrogen gas, Anode - Chlorine gas
Why is pure water a non-electrolyte?
Because contains only molecules and not ions to conduct electricity
State the charge of the electrode where oxidation takes place.
Positive
What name is given to electrolysis of water? Why?
Catalysis, because dil. sulphuric acid acts as a catalyst in the process.
What is electroplating?
Electroplating is the electrolytic process of deposition of a superior metal on the surface of a baser metal or article.
Sodium Carbonate Solution is a _________ [Strong / Weak / Non] Electrolyte.
Weak
What is kept at anode and cathode in electro-refining of copper?
Cathode: Pure thin sheet of copper, Anode: Impure block of copper
Explain how OH- ion yields oxygen gas at the anode.
4 OH- ons lose an electron each and give 2 molecules of water and one molecule of oxygen
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