Electrochemistry Test

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Electrochemistry Test - 5

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Question 1
1 / -0

Difference between electronic and ionic (electrolytic) conductivity is that electronic conductance takes place in metals by movement of ________ and electrolytic conductance takes place in solutions by movement of -----

A
electron cloud and electrolytes

B
metals and ions

C
ions and electrons

D
electrons and ions

Solution

metallic substances allow electricity to pass through them by flow of electrons and electrolytes allow electricity to pass through them in molten state and in aqueous solution by charge carried by ions.
Question 2
1 / -0

Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes because of the fact that

A
the number of collisions of ions per unit volume that carry the current in a solution increases on dilution

B
the number of ions per unit volume that carry the current in a solution decreases on dilution

C
the number of ions per unit volume that carry the current in a solution increases on dilution

D
mobility of ions that carry the current in a solution increases on dilution

Solution

Conductivity is conductance of one centimeter cube of the solution. so on dilution the number of ions per cm³ decreases.
Question 3
1 / -0

Kohlrausch law of independent migration of ions states

A
that limiting molar conductivity of an electrolyte can be represented as the difference of the individual contributions of the anion and cation of the electrolyte

B
limiting molar conductivity of anion and cation of the electrolyte with respect to nature of ions with which it is associated

C
that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte

D
that molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte

Solution

molar conductivity at infinite dilution for a given salt can be expressed as the sum of the individual contributions from the ions of the electrolyte.
Question 4
1 / -0

According to Faraday’s First Law of Electrolysis 'the amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the

A
amount of any substance obtained

B
voltage of electricity passed through the electrolyte

C
current passed through the electrolyte

D
quantity of electricity passed through the electrolyte

Solution

Faraday’s first law of electrolysis states that ,'the amount of substance deposited or liberated at any of the electrode is directly proportional to amount of charge passed through the electrolytic solution during electrolysis'.
Question 5
1 / -0

According to Faraday’s Second Law of Electrolysis, the amounts of different substances liberated by the same quantity of electricity passing through different electrolytic solution connected in series are proportional to

A
to their nuclear masses

B
their chemical equivalent weights

C
to their atomic weight

D
to their Atomic number

Solution

Faradays II law statement - when same quantity of electricity is passed through different electrolytic solutions connected in series, the weights of the substances produced at the electrodes are directly proportional to their chemical equivalent weights.
Question 6
1 / -0

Charge on one mole of electron is approximately equal to ------- faraday

A
97500 C mol^-1

B
96500 C mol^-1

C
99500 C mol^-1

D
98500 C mol^-1

Solution

Charge on one electron is 1.602 × 10⁻¹⁹C 1 mole of electron contains 6.023 × 10²³ electrons. So charge on one electron is 1.602 × 10⁻¹⁹× 6.023×10²³ = 96488 C which is approximately 96500C.
Question 7
1 / -0

In the primary batteries

A
the reaction is reversed periodically and after use over a period of time and so can be reused again

B
the reaction occurs only once and after use over a period of time battery becomes dead and cannot be reused again

C
electrode reactions can be reversed by an external energy source and can be used again and again

D
the reaction occurs only once and after use it can be recharged and reused again

Solution

In Primary batteries the electrode reactions cannot be reversed by an external energy source. so they are not chargeable.
Question 8
1 / -0

A secondary cell after use can be ________ by passing current through it in the ________ so that it can be used again.

A
recharged, opposite direction

B
recharged, same direction

C
charged, same direction

D
charged , opposite direction

Solution

Secondary cells are storage cells which can be recharged and reused again and again.
Question 9
1 / -0

Fuel cells are ________ that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into_________.

A
Galvanic cells, thermal energy

B
Galvanic cells, hydraulic energy

C
Electrolytic cells, electrical energy

D
Galvanic cells, electrical energy

Solution

Fuel Cells are voltaic cells in which the reactants are continuously supplied to the electrodes where chemical energy due to combustion of gases such as H₂, CH₄, CO, etc are directly converted to electrical energy.

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Electrochemistry Test - 5

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Question 1

electron cloud and electrolytes

metals and ions

ions and electrons

electrons and ions

Solution

Question 2

the number of collisions of ions per unit volume that carry the current in a solution increases on dilution

the number of ions per unit volume that carry the current in a solution decreases on dilution

the number of ions per unit volume that carry the current in a solution increases on dilution

mobility of ions that carry the current in a solution increases on dilution

Solution

Question 3

that limiting molar conductivity of an electrolyte can be represented as the difference of the individual contributions of the anion and cation of the electrolyte

limiting molar conductivity of anion and cation of the electrolyte with respect to nature of ions with which it is associated

that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte

that molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte

Solution

Question 4

amount of any substance obtained

voltage of electricity passed through the electrolyte

current passed through the electrolyte

quantity of electricity passed through the electrolyte

Solution

Question 5

to their nuclear masses

their chemical equivalent weights

to their atomic weight

to their Atomic number

Solution

Question 6

97500 C mol-1

96500 C mol-1

99500 C mol-1

98500 C mol-1

Solution

Question 7

the reaction is reversed periodically and after use over a period of time and so can be reused again

the reaction occurs only once and after use over a period of time battery becomes dead and cannot be reused again

electrode reactions can be reversed by an external energy source and can be used again and again

the reaction occurs only once and after use it can be recharged and reused again

Solution

Question 8

recharged, opposite direction

recharged, same direction

charged, same direction

charged , opposite direction

Solution

Question 9

Galvanic cells, thermal energy

Galvanic cells, hydraulic energy

Electrolytic cells, electrical energy

Galvanic cells, electrical energy

Solution

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97500 C mol^-1

96500 C mol^-1

99500 C mol^-1

98500 C mol^-1