12th Chemistry Monthly Test - 1 ( Electro Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1 ( Electro Chemistry )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The overall reaction that takes place in an electrochemical cell is

oxidation
reduction
decomposition
redox reaction

The empirical relationship between molar conductance and concentration of the electrolyte C is _______

\({ \Lambda }_{ m }={ { \Lambda } }_{ m }^{ ° }-k\sqrt { C } \)
\({ \Lambda }_{ m }={ { \Lambda } }_{ m }^{ ° }+k\sqrt { C } \)
\({ \Lambda }_{ m }={ { \Lambda } }_{ m }^{ ° }-\sqrt { kC } \)
\({ \Lambda }_{ m }={ { \Lambda } }_{ m }^{ ° }+\sqrt { kC } \)

The relationship between free energy change and emf of a cell is

\(\triangle G=-nFE\)
\(\triangle H=-nFE\)
\(\triangle E=-nFG\)
\(\triangle F=-nFG\)

While charging lead storage battery

PbSO₄ on cathode is reduced to Pb
PbSO₄ on anode is oxidised to PbO₂
PbSO₄ on anode is reduced to Pb
PbSO₄ on cathode is oxidised to Pb

The inert electrode is__________

Cu
Pt
Zn
None of these

Which of the statements about electrolytic conductance is not true?

Conductivity increases with decrease in viscosity.
Higher dielectric constant shows lower conductance in solution.
Temperature increases, conductance also increases.
Molar conductance increases with increase in dilution.

When one coulomb of electricity is passed through an electrolytic solution, the mass deposited on the electrode is equal to

equivalent weight
molecular weight
electrochemical equivalent
one gram

\({ Zn }_{ (s) }/{ Zn }_{ (aq) }^{ 2+ }||{ Cu }_{ (aq) }^{ 2+ }/{ Cu }_{ (s) }\)

In the above cell diagram, the single vertical line represents______

Salt bridge
Cathode
Anode
Phase boundary

Leclanche cell is _______

primary battery
secondary battery
rechargeable
both (b) and (c)

The cell in which electrical energy is used to bring about chemical change is known as_______

electrolytic cell
galvanic cell
voltaic cell
dynamo

The condition to obtain standard emf is

1M solution of reactants and products
25°C
both (a) and (b)
neither (a) and (b)

Pick out the correct statement regarding resistance of an electrolytic solution
It is inversely proportional to the length (I)

It is inversely proportional to the cross sectional area (A)

It is directly proportional to the cross sectional area (A)

Resistivity is denoted by \(\rho\) (rho)
Assertion: pure iron when heated in dry air is converted with a layer of rust.
Reason : Rust has the composition Fe₃O₄
If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Assertion is true but reason is false

Both assertion and reason are false.

When \({ \lambda }_{ c }\) decreases linearly with increase in \(\sqrt { C } \) , then it is

an insulator
a semiconductor
a weak electrolyte
a strong electrolyte

The reaction that takes place in the cathode half cell in a Galvanic cell is_______

oxidation
reduction
redox
hydrolysis

The zinc - copper cell has emf of______

1V
2.1V
1.1 V
-1.1 V

Part - B

Generic 2 - Answer All Question

For a uni - univalent electrolyte, write the Debye - Huckel Onsagar equation.

Define electrolysis.

State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution?

Give the expression that relates molar conductivity and degree of dissociation.

Give an example of secondary cell.

On what does the emf of a lead storage battery depend?

Define specific conductance.

What is meant by limiting molar conductivity?

State Faraday’s Laws of electrolysis

How are specific and equivalent conductances related?

Two metals M₁ and M₂ have reduction potential values of -xV and +y V respectively. Which will liberate H₂ and H₂SO₄?
Write a note on sacrificial protection.

Define electrochemical equivalent.

A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper.
[Given : \({ E }_{ Cu^{ 2+ }|Cu }\) = 0.34]
Why is AC current used instead of DC in measuring the electrolytic conductance?

Define resistivity.

Explain how iron is protected from corrosion by coating with magnesium.

Part - C

Generic 3 - Answer All Question

The standard reduction potential of Fe³⁺, Fe²⁺ I Pt is + 0. 771 V. This half cell is connected with another half cell such that emf of the cell is 0. 771 V. What is the other half cell?

State Ohms law.

Explain why Zn on reaction with dil. H₂SO₄ liberate hydrogen, whereas copper cannot?

Define Faraday.

Give the oxidation and reduction half cell reaction taking place in the Daniel cell.
0.1 M ·solution of two electrolytes P and Q have specific conductance 4 x I0^-4 S cm^-1 and 6 x I0^-6 S cm^-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.

Corrosion of aluminum takes place at a much slower rate than iron. Give reason.

What are the types of changes in the cathode and anode in electrolytic and electrochemical cells?

Ledanche cell is a non-rechargeable cell. Answer the questions below with respect to Leclanche cell.
(i) Anode
(ii) Cathode
(iii) Electrolyte
(iv) Oxidation half cell reaction
( v) Reduction half cell reaction.

Write the overall redox reaction for the zinc-copper cell. Show the oxidation and reduction half reaction.

Explain the relationship between free energy of the cell and Its emf.
Explain the process of recharging of lead storage battery.

Part - D

Generic 5 - Answer All Question

How will you calculate solubility product of AgCl which is a sparingly soluble salt?

Derive a relationship between dissociation constant K_a and molar conductivity \({ \Lambda }_{ m }\).

Write an account on cell terminology.

Write the electrochemical mechanism of corrosion.

Explain SHE as a reference electrode.
How will you determine the conductivity of an electrolytic solution using a wheatstone bridge?

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12th Chemistry Monthly Test - 1 ( Electro Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1 ( Electro Chemistry )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

The overall reaction that takes place in an electrochemical cell is

The empirical relationship between molar conductance and concentration of the electrolyte C is _______

The relationship between free energy change and emf of a cell is

While charging lead storage battery

The inert electrode is__________

Which of the statements about electrolytic conductance is not true?

When one coulomb of electricity is passed through an electrolytic solution, the mass deposited on the electrode is equal to

\({ Zn }_{ (s) }/{ Zn }_{ (aq) }^{ 2+ }||{ Cu }_{ (aq) }^{ 2+ }/{ Cu }_{ (s) }\) In the above cell diagram, the single vertical line represents______

Leclanche cell is _______

The cell in which electrical energy is used to bring about chemical change is known as_______

The condition to obtain standard emf is

Pick out the correct statement regarding resistance of an electrolytic solution

Assertion: pure iron when heated in dry air is converted with a layer of rust. Reason : Rust has the composition Fe3O4

When \({ \lambda }_{ c }\) decreases linearly with increase in \(\sqrt { C } \) , then it is

The reaction that takes place in the cathode half cell in a Galvanic cell is_______

The zinc - copper cell has emf of______

Part - B

Generic 2 - Answer All Question

For a uni - univalent electrolyte, write the Debye - Huckel Onsagar equation.

Define electrolysis.

State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution?

Give the expression that relates molar conductivity and degree of dissociation.

Give an example of secondary cell.

On what does the emf of a lead storage battery depend?

Define specific conductance.

What is meant by limiting molar conductivity?

State Faraday’s Laws of electrolysis

How are specific and equivalent conductances related?

Two metals M1 and M2 have reduction potential values of -xV and +y V respectively. Which will liberate H2 and H2SO4?

Write a note on sacrificial protection.

Define electrochemical equivalent.

A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper. [Given : \({ E }_{ Cu^{ 2+ }|Cu }\) = 0.34]

Why is AC current used instead of DC in measuring the electrolytic conductance?

Define resistivity.

Explain how iron is protected from corrosion by coating with magnesium.

Part - C

Generic 3 - Answer All Question

The standard reduction potential of Fe3+, Fe2+ I Pt is + 0. 771 V. This half cell is connected with another half cell such that emf of the cell is 0. 771 V. What is the other half cell?

State Ohms law.

Explain why Zn on reaction with dil. H2SO4 liberate hydrogen, whereas copper cannot?

Define Faraday.

Give the oxidation and reduction half cell reaction taking place in the Daniel cell.

0.1 M ·solution of two electrolytes P and Q have specific conductance 4 x I0-4 S cm-1 and 6 x I0-6 S cm-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.

Corrosion of aluminum takes place at a much slower rate than iron. Give reason.

What are the types of changes in the cathode and anode in electrolytic and electrochemical cells?

Ledanche cell is a non-rechargeable cell. Answer the questions below with respect to Leclanche cell. (i) Anode (ii) Cathode (iii) Electrolyte (iv) Oxidation half cell reaction ( v) Reduction half cell reaction.

Write the overall redox reaction for the zinc-copper cell. Show the oxidation and reduction half reaction.

Explain the relationship between free energy of the cell and Its emf.

Explain the process of recharging of lead storage battery.

Part - D

Generic 5 - Answer All Question

How will you calculate solubility product of AgCl which is a sparingly soluble salt?

Derive a relationship between dissociation constant Ka and molar conductivity \({ \Lambda }_{ m }\).

Write an account on cell terminology.

Write the electrochemical mechanism of corrosion.

Explain SHE as a reference electrode.

How will you determine the conductivity of an electrolytic solution using a wheatstone bridge?

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Other Study material

\({ Zn }_{ (s) }/{ Zn }_{ (aq) }^{ 2+ }||{ Cu }_{ (aq) }^{ 2+ }/{ Cu }_{ (s) }\)

In the above cell diagram, the single vertical line represents______

Assertion: pure iron when heated in dry air is converted with a layer of rust.
Reason : Rust has the composition Fe₃O₄

Two metals M₁ and M₂ have reduction potential values of -xV and +y V respectively. Which will liberate H₂ and H₂SO₄?

A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper.
[Given : \({ E }_{ Cu^{ 2+ }|Cu }\) = 0.34]

The standard reduction potential of Fe³⁺, Fe²⁺ I Pt is + 0. 771 V. This half cell is connected with another half cell such that emf of the cell is 0. 771 V. What is the other half cell?

Explain why Zn on reaction with dil. H₂SO₄ liberate hydrogen, whereas copper cannot?

0.1 M ·solution of two electrolytes P and Q have specific conductance 4 x I0^-4 S cm^-1 and 6 x I0^-6 S cm^-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.

Ledanche cell is a non-rechargeable cell. Answer the questions below with respect to Leclanche cell.
(i) Anode
(ii) Cathode
(iii) Electrolyte
(iv) Oxidation half cell reaction
( v) Reduction half cell reaction.

Derive a relationship between dissociation constant K_a and molar conductivity \({ \Lambda }_{ m }\).