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ELECTROCHEMISTRY Flashcards

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1
Q

IF THE SECIFIC CONDUCTANCE IS K , RESISTANCE IS R AND L IS DISTANCE BETWEEN ELECTRODODES AND A IS CROSS SECTIONIAL AREA OF A CONDUTOR Cm = mol L-1 AND C eq = g eq L-1 THEN SPECIFIC RESISTANCE OF ELECTROLYTE WILL BE EQUAL TO

A

RA/L

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2
Q

K IS EQUAL TO

A

1/RA
K=CONDUCTIVITY
SI UNIT SIEMENS/METER

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3
Q

MOLAR CONDUCTIVITY ʎm IS =

A

1000K/Cm
&
KA/L

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4
Q

CELL CONSTANT IS

A

L/A

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5
Q

WHICH AMONG THE FOLLOWING IS NOT CONDUCTOR OF ELECTRICITY ??
1]NACLaq
2]NACLs
3]NACLmol
4]AG

A

2]NACL S

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6
Q

BY WHICH OF THE FOLLOWING THE RESISTANCE OF SOLU IS MULTIPLIED TO OBTAIN CELL CONSTANT

A

SPECIFIC CONDUTANE OR CONDUCTIVITY K

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7
Q

INCREASE IN EQUIVAKENT CONTANCE OF THE SOLU OF AN ELECTROYLTE BY DILLUTION IS DUE TO

A

INCREASE IN IONIZATION OF ELECTROLYTE

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8
Q

IF THE SPECIFIC CONDUCTANCE AND OBVERSEED CONDUCTANCE OF AN ELECTROLYTE IS SAME THEN ITS CELL CONSTANT WILL BE

A

1

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9
Q

UNIT OF CELL CONSTANT IS

A

CM-1

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10
Q

UNIT OF SPECIFIC CONUCTANCE IS

A

OHM-1CM-1

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11
Q

IF THE CONVERSATION OF ANY SOLUTION IS C GRAM EQUIVALENT / LITRE AND SPECIFIC RESISTANCE IS A ITS EQUIVALENT CONDUCTANCE WILL BE

A

1000A/C

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12
Q

THE COATING OF LAYER OF ZINC ON IRON TO PREVENT IT FROM CORROSION IS CALLED

A

GAKVANIZATION

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13
Q

A SATURATED SOLTUION OF KNO3 IS USED FOR SALT BRIDGE BECAUSE

A

SPEED OF BOTH CATION ANION IS NEARLY SAME

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14
Q

ACTS AS DIPOLAR IN DRY CELLS

A

MnO2

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15
Q

REDUCTION IS KNOWN AS

A

ELECTRONATION

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16
Q

WHAT IS PATH OF ELECTRIC CURRENT IN A DAINEL CELL WHEN ZN AND CU ELECTRODES ARE CONNECTED

A

FROM ZN TO CU OUTSIDE THE CELL

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17
Q

IN A CELL CONTAINING ZN ELECTRODE AND NORMAL HYDROGEN ELECTRODE [NHE] ZN ACT AS

A

ANODE

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18
Q

IF A SALT BRIDGE IS REMOVED FROM HALF CELLS THEN VOLTAGE

A

REDUCES AND BECOMES 0

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19
Q

WHEN LEAD STORAGE BATTERY IS DISCHARGED WHAT IS USED

A

H2SO4 IS USED

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20
Q

PROCESS OF RUSTING OF IRON IS

A

CORROSION

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21
Q

VALUE OF STANDARD POTENTIAL OF HYDROGEN ELECTRODE IS

A

ZERO

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22
Q

ACETIC ACID IS — ELECTROLYTE

A

WEAK

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23
Q

CONDUCTANCE OF ELECTROLYTE — WITH INCREASE IN TEMP

A

INCREASE

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24
Q

ON INCREASING DILUTION THE VALUE OF SPECIFIC CONDUCTANCE OF A SOLU

A

DECREASES

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25
Q

—- DECREASES WITH INCRESE IN SIZE OF ION

A

CONDUCTANCE

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26
Q

PRIMARY CELLS CANNOT —- AGAIN

A

CHARGED

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27
Q

DEVICE WHICH CONVERTS CHEMICAL ENERGY INTO ELECTRICAL ENERGY IS KNOWN AS —

A

ELECTROCHEMIAL CELL

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28
Q

AMOUNT OF ELECTRIC CURRENT WHICH PRODUCES ONE GRAM EQUIVALENT OF A SUBSTANCE KNOWN AS

A

FARADAY

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29
Q

IN METALLIC CONDUCTION —-OROPERTY REMAINS UNCHANGED

A

CHEMICAL

30
Q

RECIPROCAL OF RESISTANCE IS KNOWN AS —

A

CONDUCTANCE

31
Q

CONDUCTANCE OF 1CM CUBE OF A CONDUCTOR IS CALLED

A

SPECIFIC CONDUCTANCEE

32
Q

1 FARDAY IS EQUAL TO —-COULOMB

A

96500

33
Q

RUSTING OF IRON IS AN EXAMPLE OF

A

CORRSION

34
Q

POTENTIAL OF STANDARD HYDROGEN ELECTRODE IS ASSUMED TO BE

A

0

35
Q

IN ELECTROLYTIC CELL OF AQ SOLUTION , NA METAL IS ROD ELECTRODE

A

FALSE

36
Q

IN KO2 OXIDATION STATE OF OXYGEN IS ZERO.

A

FALSE

37
Q

SN+2 OXIDIES FE+3

A

FALSE

38
Q

ZN/ZNSO4 IS REFERNACE ELECTRODE

A

FALSE

39
Q

EFFICENCY OF HYDROGEN OXYGEN FUEL CELL IS 23%.

A

FALSE

40
Q

RELATION OF ∆G=-nFE TRUE FALSE ??

A

TRUE

41
Q

SALT BRIDGE MAINTAINS ELECTRICAL NETURALILTY BETWEEN TWO SOLUTIONS

A

TRUE

42
Q

IN THE CELL ZN|ZN+2||CU+2|CU
ZN E;ECTRODE IS

A

NEGATIVE

43
Q

ELECTRICAL NETURALLITY OF BOTH THE HALF CELLS IS MAINTAINED

A

SALT BRIDGE

44
Q

THE E* VALUE OF THE HALF CELL WHOSE ELECTRODE HAS LESS TENDANCY TO RELEASE ELECTRON THAN H2

A

POSITIVE

45
Q

EXAMPLE OFSTRONG EECTROLYTE

A

HCL, NAOH, NACL

46
Q

EXAMPLE OF WEAK ELECTROLYTE

A

CH3COOH , H2CO3

47
Q

WHAT IS EFFECT OF TEMP ON ELECTROLYTIC CONDUCTIVITY

A

INCREASES

48
Q

KOHLRAUSCH LAW

A

REFER GOOGLE 😅😅
AS FORMULA IMP BUT CANT TYPE

49
Q

EQUIVALENT CONDUCTANCE FORMULA

A

ʎeq=1000*V1/Ceq

50
Q

MOLAR CONDUCTANCE FORMULA

A

ʎm = 1000*v1/Cm

51
Q

DEVICE WHICH CONVERTS ELECTRICAL ENERGY INTO CHEMIACL ENERGY

A

ELECTROLYTIC CELL

52
Q

WHAT IS THE POTENTIAL PRODUCED DUE TO REDOX RXN BETWEEN A METAL ELECTRODE AND ITS ION CALLED

A

ELECTRODE POTENTIAL

53
Q

WHAT IS THE POTENTIALOF BOTH THE ELECTRODES OF THE CELL DUE TO WHICH ELECTRIC CURRENT FLOWS IN THE CELL

A

ELECTROMOTIVE FORCE

54
Q

WHAT IS UNIT OF POTENTIAL DIFFERENCE ?

A

VOLT

55
Q

THE CELL WHICH IS RECHAREGED IS KNOWN AS

A

SECONDARY CELL

56
Q

UNIT OF EQUIVALENT CONDUCTANCE

A

OHM CM2 GM EQ-1

57
Q

WHAT IS CHEMICAL COMPOSTION OF RUST ?

A

FE2O3.xH2O

58
Q

WHAT IS NAME OF RXN IN WHICH OXIDATION AND REDUCTION TAKE PLACE SIMILTANEOUS;Y

A

REDOX RXN

59
Q

WHY DOES THE CONDUCTIVITY OF A SOLU DECREASE WITH DILTUOION

A

BECUZ NO OF IONS PER CM3 DREASES

60
Q

DEFINATION OF ELECTROCHEMICAL CELL

A

SYSTEM IN WHICH CHEMICAL ENERGY IS CONERTED INTO ELECTRICAL ENERGY BY OXIDATION REDUCTION IS KNOWN AS ELECTROCHEMICAL CELL OR VOLTRIC CELL

61
Q

WHAT IS ELECTRODE POTENTIAL

A

THE POTENTIAL DIFFERANCE DELVELOPED BETWEEN THE ELECTRODES AND ELECTROLYTE OF AN ELECTORLTIC CELL IS KNOWN AS ELECTRODE POTENTIAL .

62
Q

STANDARD ELECTRODE POTENTIAL

A

STANDARD ELECTRODE POTENTIAL OF A HALF CELL OS THE POTENTIAL DIFFERANCE WHEN 1 ELECTRODE IS DIPPED IN MOLAR SOLU OF ITS ION AT298K . IF THE ELECTRODE IS GASEOUS THE PRESSURE OF GAS MUST BE ONE ATOMSPHERE

IN IUPAC SYS REDUCTION POTENTIAL IS STANDARD ELECTRODE POTENTIAL

63
Q

WHY IS IT NOT POSSIBLE TO DETERMINE THE ELECTRODE POTENTIAL OF SINGLE HALF CELL

A

BECAUSE ELECTROMOTIVE FORCES OF 2 ELECTRODE CONTANING A COMPLETE CIRCUIT CAN BE MEASURED

64
Q

WHAT IS SALT BRIDGE ?? WRITE ITS TWO FUNCTIONS ??

A

U SHAPED TUBE FILLED WITH KCL OR KNO3 IN AGAR AGAR SOLUTION OR GELATIN IS KNOWN AS SALT BRIDGE . ITS CONNECTED TWO HALF CELL

FUNCTION
1] IT ALLOWS THE FLOW OF CURRENT BY COMPLETING THE CIRCUIT
2]IT MAINTAINS THE ELECTRICAL NETURALLITY .

65
Q

DEFINATION OF METALLIC CONDUCTION

A

METALLIC CONDUCTION TAKES PLACE BY MOVEMENT OF ELECTRONS
THERE IS NO CHEMICAL CHANGE .
THERE IS NO TRANSFER OF MATTER
IN METALLIC CONDUCTION CONDUCTIVITY DECREASES WITH INCREASE IN TEMP

66
Q

ELECTROLYTIC CONDUCTION

A

ELECTRLYTIC CONDUCTION TAES PLACES BY MOVEMENT OF IONS
DUE TO CHEMICAL CHANGE DECOMPOSTION OF ELECTROLYTE TAKES PLACE .
TRANSFER OF MATTER TAKES PLACE AS IONS
IN ELECTROLYTIC CONDUCTION CONDUCTIVITY INCREASES WITH INCREASE IN TEMP

67
Q

EMF /CELL POTENTIAL

A

IT IS THE POTENTIAL DIFFERANCE BETWEEN 2 TERMINALS OF CELL WHEN NO CURRENT IS FLOWING IN THE CIRCUIT IE. IN AN OPWN CIRCUIT
ITS MAXIMUM VOLTAGE WHICH CAN BE OBTANIED FROM CELL
IT CAN BE MEASURED BY POTENTIAMETRIC
WORK DONE BY ELECTROMOTIVE FORCE IS MAXIMUM WORK DONE BY A CELL
IT IS RESPONSIBLE FOR CONTIOUS FLOW OF CURRENT IN ELECTRIC CIRCUIT

68
Q

POTENTIAL DIFFERANCE

A

IT IS THE DIFFERANCE OF THE ELECTRODES POTENTIAL OF 2 ELECTRODES WHEN THE CELL IS SENDING CURRENT THROUGH THE CIRCUIT
IT IS LESS THA MAXIMUM VOLTAGE AS IT DIFF BETWEEN ELECTRODES
IT CAN BE MEASURED BY SIMPLE VOLTMETER
WORK DONE BY POTENTIAL DIFFERENCE IS LESS THAN THE MAXIMUM WORK DONE BY A CELL
IT IS NOT RESPONSIBLE FOR CONTIOUS FLOW OF CURRENT IN ELECTRIC CRICUIT .

69
Q

DEFINE RESTIVITY

A

WHEN CURRENT FLOW IN THE SOLU THROUGH 2ELECTRODES THE RESITANCE IS PORPOSTIALNAL TO LENGTH AND INVERSELY PROPOSTIONAL TO CROSS SECTIONAL AREA A

70
Q

ELECTROCHEMICAL SERIES

A

THE SERIES IN WHICH ELEMENT ARE ARRANGED IN INCREASING ORDER OF STANDRD ELECTRODE POTENTIAL IS KNOWN AS ELECTROCHEMICAL SERIES

71
Q

GALVONIC CELL DEFINATION

A

IT IS A DEVICE TO CONVERT CHEMICAL ENERGY INTO ELECTRICAL ENERGY
IT CONSIST OF TWO ELECTRODES IN DIIFERENT COMPARTMENETS JOINED WITH SALT BRIGDE REDOX RXN OCCURING IN THE CELL ARE SPOENTENOUS
FREE ENERGY DECREASE

72
Q

ELECTROLYTIC CELL

A

IT IS A DEVICE TO CONVERT ELECTRICAL ENERGY INTO CHEMICAL ENERGY
BOTH ELECTRODES ARE IN SAME SOLU
REDOX RXN OCCURING IN CELLS ARE NOT SPONTEOUS
FREE ENGERY INCREASES

chemistry (9 decks)

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