Electro Chemistry

Question 1

Resistance in electrolytic conductor is due to

Answer 1

Viscosity of medium; inter ionic attraction.

Question 2

Conductance (g) =

Answer 2

1/r

Question 3

Cell constant =

Answer 3

G* = l/a

Question 4

Specific conductance (K)

Answer 4

K = gxg*

Question 5

Molar conductivity or conductance =

Answer 5

Kx v or kx1000 /M

Question 6

Equivalent conductivity

Answer 6

K x 1000/N

Question 7

Relation b/ w molar & eqw. Conductance

Answer 7

Eqw. Conductance= molar conductance/valence factor

Question 8

Factors affecting electrolytic conductance

Answer 8

A) inter ionic attraction.
B. Polarity of solvent
C. Viscosity oF medium
D. Hydrated size
E. Dilution.

Question 9

Inter ionic attractions ↑ then

Answer 9

Conductance ↓

Question 10

Dielectric constant (polarity) ↑ then

Answer 10

Conductance ↑

Question 11

Viscosity ↑

Answer 11

Conductance ↓

Question 12

Temp ↑ then

Answer 12

Conductance ↑ k.e ↑ viscosity ↓ f.a ↓

Question 13

Hydration of ions ↑

Answer 13

Conductance ↓

Question 14

On dilution of strong electrolyte and weak electrolyte

Answer 14

) Inter atomic forces ↓ conductance ↑
) a↑ conductance ↑

Question 15

On dilution; specific conductance

Answer 15

↓ as no of ions in 1 ml solution ↓

Question 16

Molar and equivalent conductance effector on dilution

Answer 16

↑ as M and N↓

Question 17

Molar conductance of electrolytes at infinite dilution

Answer 17

^m=^m*- b root c,, where b is coast. (Molar conductance ^m)

Question 18

^eq* of cation and anion at infinite dilution*

Answer 18

^eq(c) + ^ eq (a)

Question 19

Molar condctsnce at infinite dilution

Answer 19

^m * =x^m* (c) + ^m*(a)

Question 20

Calculating degree of dissociation using kohl law.

Answer 20

Degree of disassociation =^ /^* [ equivalent conductance at given concentration/
equivalent conductance at Infiniti dilution ]

Question 21

Dissociation constant of weak electrolyte

Answer 21

K= Caa/1-a [ a= degree of dissocition)
If a =5 or a<5 then K = caa

Question 22

Solubility of sparingly soluble salt

Answer 22

S= Kx 1000 /^m*

Question 23

Debye huckel onsagr equation

Answer 23

Vm=Vm* + a root C