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Chem > Electrolysis > Flashcards

Electrolysis Flashcards

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1
Q

Electrolysis literally means

A

Pertaining to the flow of electrons

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2
Q

What does electrolysis result in

A

Discharge of ions as neutral atoms at the respective electrodes

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3
Q

Electrolysis is a ____ reaction

A

Redox

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4
Q

Electrolytes are ____ compounds

A

Ionic

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5
Q

Particles in electrolytes

A

Ions only or Ions and molecules only

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6
Q

Non electrolytes are ____ compounds

A

Covalent

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7
Q

Particles in non electrolytes

A

Molecules only

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8
Q

Examples of electrolytes

A

HCl, HNO3, CuSO4 , PbBr2, etc

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9
Q

Examples of non electrolytes

A

Pure water, Cs2, CCl4 , sugar solution, glucose, etc

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10
Q

Particles in strong electrolytes

A

Ions only

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11
Q

Example of 3 bases which are weak electrolytes

A

NH4OH, Mg(OH)2 , Ca(OH)2

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12
Q

Particles in weak electrolytes

A

Ions and unionised molecules

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13
Q

The device in which electrolysis is carried out

A

Electrolytic cell

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14
Q

Electrolytic cell is also known as ____

A

Voltammeter`

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15
Q

Metal plates which allow electric current to enter or leave the cell

A

Electrodes

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16
Q

Sometimes, graphite electrodes are used instead of metals? when

A

When products formed during electrolysis react with metals

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17
Q

Electrode connected to the positive terminal of the battery

A

Anode

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18
Q

Electrode connected to the negative terminal of the battery

A

Cathode

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19
Q

_____ migrate to anode

A

Anions

20
Q

___ migrate to cathode

A

Cations

21
Q

____ is the oxidising electrode

A

Anode

22
Q

_____ is the reducing electrode

A

Cathode

23
Q

Atoms which carry positive charge -_____

Atoms which carry negative charge - ______

A

Cations, Anions

24
Q

Mechanism of electrolysis was first explained by ___ _____ in the year ____

A

Avante Arrhenius, 1887

25
Q

Avante Arrhenius belonged to ___

A

Sweden

26
Q

An electrolytic solution is in _____ _____

A

Electrolytic equilibrium

27
Q

___________ is the extent to which an electrolyte dissociates into ions

A

Degree of dissociation

28
Q

________ is responsible for the flow of current through the solution

A

Ions

29
Q

In electrolysis, exchange of electrons takes place at the _____

A

Surface of the electrodes

30
Q

Amount of electricity conducted by the electrolyte depends on

A

Concentration of ions in the solution

31
Q

Electrolytic dissociation takes place in ____ compounds and involves _____ of ions

A

Ionic, separation

32
Q

Ionisation takes place in ____ compounds and involves ___ of ions

A

Covalent, formation

33
Q

__ ions are essential for conducting electricity

A

Free

34
Q

water is a __ solvent

A

Polar

35
Q

Polar covalent compounds are non electrolytes in the __ state but ionise in ___ state

A

Gaseous , Aq.soln

36
Q

When an ionic compound is heated, what does the ions gain

A

Kinetic energy

37
Q

in a metal, flow of electricity takes place by the flow of ____

A

Electrons

38
Q

during ___ conduction there is no transfer of matter

A

Metallic

39
Q

Copper is a good conductor of electricity but a non electrolyte ..why

A

does not undergo chemical decomp when electric current flows via it `

40
Q

Electrolytes can be classified as strong or weak depending on

A

degree of dissociation

41
Q

No. of electrons gained at anode =

A

No. of electrons donated by cathode

42
Q

What is metal activity series otherwise called as

A

Electrochemical series

43
Q

On what basis is the metal activity series arranged

A

Ease with which metals lose electrons

44
Q

Elements which ionise _____ and are discharged with ___ are on the top of metal activity series

A

most readily, difficulty

45
Q

Elements which ionise ______ and are discharged ________ are on the bottom of the metal activity series

A

with great difficulty, easily

46
Q

State electrochemical series for metals

A 
K
Ca
Na
Mg
Al
Zn
Fe
Pb
H
Cu
Hg 
Ag
47
Q

State electro chemical series for anions

A 
SO4 2-
NO3 1-
Cl 1-
Br 1-
I   1-
OH 1-

Chem (5 decks)

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