electrochemistry

Question 1

daniel cell

Answer 1

Zn-Cu

Question 2

conditions for electrolyte used in salt bridge

Answer 2

1. inert electrolyte 2. good ionic mobility 3. equal mobility

Question 3

oxidation potential

Answer 3

tendency to lose e

Question 4

more negative potential = more _ potential

Answer 4

oxdn

Question 5

factors affecting electrode potential

Answer 5

1. nature of metal and its ions 2. concentration of ions 3. temperature

Question 6

Delta G formula

Answer 6

-nFdeltaV

Question 7

farad value

Answer 7

96500

Question 8

farad value

Answer 8

96500

Question 9

nernst eq

Answer 9

E=Eo-0.059(logP/R)/n

Question 10

equilibrium constant

Answer 10

Eoc×n/0.059

Question 11

faraday law 1

Answer 11

m is directly proportional to Q
m=ZQ=Zit
Z=E/F

Question 12

faraday law 2

Answer 12

m directly proportional to Eq Mass

Question 13

product on electrolysis of molten nacl /inert electrodes

Answer 13

Na and Cl

Question 14

on electrolysis of MgBr2 molten with Pt electrodes, brown vapours formed are of?

Answer 14

Br2

Question 15

electrolyssi of Aq NaCl conc with Pt electrode

Answer 15

NaOH is left and Cl2 and H2 escape

Question 16

product of electrolysis of dil nacl and anode cathode ions

Answer 16

Nacl gives Na and Cl
H2o gives H and Oh
Anode- OH (since conc more than cl) and Cathode- H

Question 17

Aq Nacl with Hg as cathode, Pt as anode

Answer 17

at cathode, Hg and Na react to form sodium amalgan
anode- Cl oxidised

Question 18

what happens on electrolysis of Aq Nacl with Aq electrodes

Answer 18

anode-Ag/Ag+
cathode-Ag+/Ag
gradually cathode becomes heavier and anode becomes lighter

Question 19

what is aq Nacl with ag electrodes used fir

Answer 19

metal refining and electroplating

Question 20

cell constant

Answer 20

l/A

Question 21

conducivity formula

Answer 21

K=conductance×cell const

Question 22

molar conductivity formula

Answer 22

K×1000/M

Question 23

equivalent conductivity formula

Answer 23

K×1000/N

Question 24

relation between eq and molar conductivity

Answer 24

molar/eq=X

Question 25

how does dilution affect conductance, conductivity and molar/eq conductivities of electrolytes

Answer 25

1. inc 2. dec 3. inc

Question 26

dry cell/leclance cell electrodes

Answer 26

A- zinc, C- Graphite with MnO2+c powder

Question 27

mercury cell

Answer 27

a- znhg amalgam, c- HgO and Cpaste

Question 28

lead storage battery electrodes

Answer 28

A-zn, C- Pb grid packed with PbO2

Question 29

fuel cells are

Answer 29

galvanic cells designed to convert energy of combustion of fuels into electrical energy

Question 30

what is iron plated with to prevent corrosion

Answer 30

zinc

Question 31

what acts as the catalyst during rusting

Answer 31

water

Question 32

H2SO4 is consumed when lead storage battery is

Answer 32

discharged

Question 33

in an electrolytic cell, current flows from

Answer 33

Cathode to anode

Question 34

what is the cathode in a dry cell

Answer 34

carbon rod

Question 35

in a leclanche cell, zn rod is placed in

Answer 35

20% NH4CL