EASY

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Which of the following statements is correct regarding the conductivity of the solutions of electrolytes.

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Important Questions on Thermal Effect and Chemical Effect of Current

HARD

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

Calculate the molarity of a solution containing

5 g

N a O H

dissolved in the product of a

H_{2} - O_{2}

fuel cell operated at

1 A

current for

595.1

hours.

(Assume

1 F = 96500 C / m o l

of electrons and molecular weight of

N a O H

40 g m o l^{- 1}

)

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

The number of electrons delivered at the cathode, during electrolysis by a current of

1 ampere in 60 seconds

is (charge on electron

= 1.60 \times 10^{- 19} C

)

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

For electroplating,

1.5 amp

current is passed for

250 s

through

250 m L of 0.15 M

solution of

M S O_{4} .

Only

85 %

of the current was utilised for electrolysis. The molarity of

M S O_{4}

solution after electrolysis is closest to [Assume that the volume of the solution remain constant]

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

A current of $10.0 A$ flows for $2.00 h$ through an electrolytic cell containing a molten salt of metal $X$ . This results in the decomposition of $0.250 mol$ of metal $X$ at the cathode. The oxidation state of $X$ in the molten salt is:

$(F = 96, 500 C)$

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

A fuel cell generates electricity by using methanol as fuel and

O_{2}

as the oxidant. Calculate the equivalent weight of methanol.

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

The density of metal and equivalent weight of a metal are

10.5 g {cm}^{- 3}

and

100

, respectively. The time required for a current of

3 amp

to deposit a

0.005 mm

thick layer of the same metal on an area of

80 {cm}^{2}

is closest to

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is:

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

A solution of

N i {(N O_{3})}_{2}

is electrolyzed between platinum electrode

0.1

Faraday electricity. How many mole of

N i

will be deposited at the cathode?

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

Two Faraday of electricity is passed through a solution of

C u S O_{4}

. The mass of copper deposited at the cathode is: (Atomic mass of Cu = 63.5 amu)

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

A constant current (0.5 amp) is passed for 1 hour through (i) aqueous

A g N O_{3}

. (ii) aqueous

C u S O_{4}

and (iii) molten

A l F_{3}

, separately. The ratio of the mass of the metals deposited on the cathode is

[M_{Ag}, M_{Cu}, M_{Al}

are molar masses of the respective metals

]

HARD

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

How long (approximate) should water be electrolysed by passing through

100

amperes

current so that the oxygen released can completely burn

27.66 g

of diborane? (Atomic weight of

B = 10.8 u

)

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

In order to oxidize a mixture of one mole of each of

F e C_{2} O_{4}, F e_{2} {(C_{2} O_{4})}_{3}, F e S O_{4}

and

F e_{2} {(S O_{4})}_{3}

in acidic medium, the number of moles of

K M n O_{4}

is:

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing

0.2

Faraday electricity through an aqueous solution of potassium succinate, what is the total volume of gases (at both cathode and anode) at STP (

1 atm

and

273 K

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

A solution of

N i {(N O_{3})}_{2}

is electrolyzed between platinum electrodes using a current of

5

amperes for

20

minutes. What mass of

N i

is deposited at the cathode?

HARD

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

108 g

of silver (molar mass

108 g {m o l}^{- 1}

) is deposited at cathode from

{A g N O}_{3} (a q)

solution by a certain quantity of electricity. The volume (in

L

) of oxygen gas produced at

273 K

and

1

bar pressure from water by the same quantity of electricity is

\frac{x}{10}

. Value of

' x'

to the nearest integer is _____.

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

The weight of silver (at.wt.

= 108

) displaced by a quantity of electricity which displaces

5600 m L

O_{2}

STP

will be

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

When

0.1 m o l {M n O}_{4}^{2 -}

is oxidized the quantity of electricity required to completely

M n O_{4}^{2 -}

M n O_{4}^{-}

EASY

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

During the electrolysis of molten sodium chloride, the time required to produce

0.10 mol

of chlorine gas using a current of

3 amperes

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

4 g

of copper was dissolved in

conc . {HNO}_{3}

. The copper nitrate thus obtained gave

5 g

of its oxide on strong heating the equivalent weight of copper is

MEDIUM

Physics>Electricity and Magnetism>Thermal Effect and Chemical Effect of Current>Chemical Effect of Electric Current

State Faraday's law of electrolysis.

Which of the following statements is correct regarding the conductivity of the solutions of electrolytes.

Important Questions on Thermal Effect and Chemical Effect of Current

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