MEDIUM

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Write a sentence to explain what an electrical insulator is.

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 :

MEDIUM

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

The graph of

\sqrt{C} vs \land_{m}

for an aqueous solution of which substance is not obtained as a straight line?

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)

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

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

Give a reason for the following.
Conductivity of dilute hydrochloric acid is greater than that of acetic acid.

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

What is the common unit of conductivity if the dimensions are expressed in centimeter?

MEDIUM

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

Define super conducting transition temperature.

EASY

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

The specific conductance of an aqueous

{KNO}_{3}

solution at

298 K,

for a fixed concentration is

0.024 {ohm}^{- 1} {cm}^{- 1} .

If the resistance of a cell containing this solution at

298 K

was found to be

85 ohm,

then find its cell constant.

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.

Write a sentence to explain what an electrical insulator is.

Important Questions on Electricity and Chemical Change

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