MEDIUM

Earn 100

Jawad is hot and sweaty. He touches some bare connecting wire of a fan where the plastic insulation has worn away. What happens to Jawad? List the factors that caused this to happen.

Important Questions on Electricity and Chemical Change

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

_____ are the reason for the electrical conductance of sodium chloride in molten state.

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Define the following terms: Specific conductance.

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Define the following terms:
Resistivity

HARD

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The equivalent conductance (

Λ

) of an aqueous solution of a strong electrolyte of concentration

[X]

is given by

Λ = Λ_{0} - {Ac}^{1 / 2}

, where

A

is a constant and

c

is the concentration of the electrolyte. The specific conductance

κ

(with

Λ = 1000 κ / c

) of

NaCl

and

KCl

salt solutions (aqueous) are plotted against

c

. The correct figure is: (The plots are not drawn to scale.)

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

An electrolyte of a polymer-salt complex of poly (ethylene oxide) -

{LiCF}_{3} {SO}_{3}

is shaped into a free standing circular film of

20 mm

diameter and a thickness of

20 μ m .

When it is sandwiched between 2 stainless steel circular electrodes of the same diameter, this cell exhibits a conductance of

\frac{314}{5} S .

What is the specific conductivity of the electrolyte?

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Define conductance and give its unit.

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Unit of specific conductance :

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

What is the SI unit of conductivity?

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The value of electrical resistance at super conductivity state is

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

If the conductivity of mercury at

0 ° C

1.07 \times 10^{6} S m^{- 1}

and the resistance of a cell containing mercury is

0.243 Ω,

then the cell constant of the cell is

x \times 10^{4} m^{- 1} .

The value of

x

is ______ . (Nearest integer)

HARD

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

\land_{m}^{o}

for

NaCl, HCl

and

NaA

are

126.4, 425.9

and

100 .5 S {cm}^{2} {mol}^{- 1}

respectively. If the conductivity of

0 .001 M HA

5 \times 10^{- 5} S {cm}^{- 1}

, degree of dissociation of

HA

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Amongst the following, the form of water with the lowest ionic conductance at

298 K

is:

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The molar conductivity of a

0.5 mol {dm}^{- 3}

solution of

A g N O_{3}

with electrolytic conductivity of

5.76 \times 10^{- 3} S c m^{- 1}

298 K

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Which of the following solutions of

KCl

will have highest specific conductance?

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The specific conductance

(K)

0 .02 M

aqueous acetic acid solution at

298 K

1 .65 \times 10^{- 4} S {cm}^{- 1} .

The degree of dissociation of acetic acid is

[Given: equivalent conductance at infinite dilution of

H^{+} = 349 .1 S {cm}^{2} {mol}^{- 1}

and

{CH}_{3} {COO}^{-} = 40 .9 S {cm}^{2} {mol}^{- 1}

]

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The molar conductivities of

HCl, NaCl, {CH}_{3} COOH

and

{CH}_{3} COONa

at infinite dilution follow the order

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

If the molar conductivities

(in S {cm}^{2} {mol}^{- 1})

NaCl, KCl and NaOH

at infinite dilution are 126 and 150 and 250 respectively, the molar conductivity of

KOH (in S {cm}^{2} {mol}^{- 1})

is -

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The electrical resistance of a column of

0.05 MNaOH

solution of diameter

1 cm

and length

50 cm

6.5 \times 10^{3} ohm .

Its molar conductivity will be

MEDIUM

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

Let

C_{NaCl}

and

{C_{BaSO}}_{4}

, be the conductances (in S) measured for saturated aqueous solutions of

NaCl

and

B a S O_{4}

respectively, at a temperature T. Which of the following is false?

EASY

Chemistry>Physical Chemistry>Electricity and Chemical Change>Conductors and Insulators

The decreasing order of electrical conductivity of the following aqueous solutions is:

(A)

0.1 M

Formic acid,

(B)

0.1 M

Acetic acid,

(C)

0.1 M

Benzoic acid.

Jawad is hot and sweaty. He touches some bare connecting wire of a fan where the plastic insulation has worn away. What happens to Jawad? List the factors that caused this to happen.

Important Questions on Electricity and Chemical Change

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