In the electrochemical cell ${\rm{Zn|ZnS}}{{\rm{O}}_4}(0.01{\rm{M}})||{\rm{CuS}}{{\rm{O}}_{\rm{4}}}(1.0{\rm{M}}){\rm{|Cu,}}$ the emf of this Daniel cell is ${{\rm{E}}_1}.$ When the concentration of ${\rm{ZnS}}{{\rm{O}}_4}$ is changed to 1.0 M and that of ${\rm{CuS}}{{\rm{O}}_{\rm{4}}}$ changed to 0.01 M, the emf changes to ${{\rm{E}}_2}.$ From the following , which one is the relationship between ${{\rm{E}}_{\rm{1}}}{\rm{ \;and\;}}\,{{\rm{E}}_2}\,?$ (Given, $\frac{{{\rm{RT}}}}{{\rm{F}}} = 0.059$)

${{\rm{E}}_2} = 0 \ne {{\rm{E}}_1}$

The electrolysis of a solution resulted in the formation of ${{\rm{H}}_2}$ at the cathode and ${\rm{C}}{{\rm{l}}_2}$ at the anode. The liquid is:

${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ solution

${\rm{CuC}}{{\rm{l}}_2}$ solution in water

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Electro chemistry practice · Easy

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121 Easy

121 of 138

Remembering +4 | -1

In an electrolytic cell, the anode and cathode are respectively represented as :

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Correct option: A

Positive electrode, negative electrode

Option A is correct because, by convention, the anode is the positive electrode where oxidation occurs, and the cathode is the negative electrode where reduction occurs in an electrolytic cell.

122 Easy

122 of 138

Application +4 | -1

What weight of copper will be deposited by passing 2 faraday of electricity through a solution of Cu(II) salt?

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Correct option: B

63.5 g

Option B (63.5 g) is correct because 2 Faradays of electricity will deposit 1 mole of Cu from a Cu(II) salt solution, which is equal to the molar mass of copper (63.5 g).

123 Easy

123 of 138

Application +4 | -1

In the electrochemical cell

\mathrm{Zn|ZnS}{\mathrm{O}_4}(0.01\mathrm{M})||\mathrm{CuS}{\mathrm{O}_\mathrm{4}}(1.0\mathrm{M})\mathrm{|Cu,}

the emf of this Daniel cell is

{\mathrm{E}_1}.

When the concentration of

\mathrm{ZnS}{\mathrm{O}_4}

is changed to 1.0 M and that of

\mathrm{CuS}{\mathrm{O}_\mathrm{4}}

changed to 0.01 M, the emf changes to

{\mathrm{E}_2}.

From the following , which one is the relationship between

{\mathrm{E}_\mathrm{1}}\mathrm{ \;and\;}\,{\mathrm{E}_2}\,?

(Given,

\frac{{\mathrm{RT}}}{\mathrm{F}} = 0.059

)

View answer and explanation

Correct option: D

{\mathrm{E}_1} > {\mathrm{E}_2}

Option D (

{\mathrm{E}_1} > {\mathrm{E}_2}

) is correct because, according to the Nernst equation, increasing the concentration of the reactant and decreasing the concentration of the product will increase the cell potential.

124 Easy

124 of 138

Analyzing +4 | -1

Select the correct statements among the following.

(i) Copper sulphate solution can't be stored in a zinc pot.

(ii) The potential of individual half cell can be measured at

298 \mathrm{~K}

and at 1 bar pressure.

(iii) Copper can dissolve in dil.

\mathrm{HCl}

but it cannot dissolve in nitric acid due to passive nature of nitrate ion towards copper.

(iv) Platinum and gold electrodes can be used both as anode and cathode.

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Correct option: A

Only (i) and (iv)

Option A (Only (i) and (iv)) is correct because copper sulphate cannot be stored in a zinc pot due to a redox reaction, and platinum/gold can be used as both anode and cathode due to their inertness.

125 Easy

125 of 138

Understanding +4 | -1

Stainless steel does not rust because

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Correct option: B

Chromium forms an oxide layer and protects iron from rusting

Option B (Chromium forms an oxide layer and protects iron from rusting) is correct because chromium forms a passive layer of chromium oxide (

Cr_2O_3

) that prevents further oxidation of the iron.

126 Easy

126 of 138

Remembering +4 | -1

Rust is a mixture of :

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Correct option: C

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}{\kern 1pt} {\kern 1pt} {\rm{and{\kern 1pt} {\kern 1pt} Fe}}{\left( {\mathrm{OH}} \right)_3}

Option C (

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}{\kern 1pt} {\kern 1pt} {\rm{and{\kern 1pt} {\kern 1pt} Fe}}{\left( {\mathrm{OH}} \right)_3}

) is correct because rust is a hydrated form of iron(III) oxide and iron(III) hydroxide.

127 Easy

127 of 138

Remembering +4 | -1

The electroplating with chromium is undertaken because :

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Correct option: C

Chromium gives a protective and decorative coating to the base metal

Option C is correct because chromium electroplating provides a protective and decorative coating to the base metal, enhancing its corrosion resistance and appearance.

128 Easy

128 of 138

Remembering +4 | -1

Coulomb is the quantity of current defined as :

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Correct option: D

All of the above

Option D is correct because a coulomb is defined as the quantity of charge transferred by a current of one ampere flowing for one second, and it's also related to the deposition of silver and electrochemical equivalence.

129 Easy

129 of 138

Remembering +4 | -1

The apparatus in which electrical energy is converted into chemical energy is known as :

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Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because both voltameters and coulometers are devices used to convert electrical energy into chemical energy through electrolysis.

130 Easy

130 of 138

Remembering +4 | -1

An apparatus used for the measurement of quantity of electricity is known as a :

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Correct option: C

Coulometer

Option C is correct because a coulometer is specifically designed to measure the quantity of electricity (charge) passed during an electrochemical process.

131 Easy

131 of 138

Analyzing +4 | -1

Assertion: The degree of dissociation of a weak electrolyte depends on the nature of the electrolyte as well as on the concentration of the electrolyte.

Reason: The degree of dissociation of a weak electrolyte is directly proportional to the square root of the concentration of the electrolyte.

View answer and explanation

Correct option: B

Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion

Option B (Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion) is correct because both statements are true, but the reason doesn't fully explain the assertion.

132 Easy

132 of 138

Understanding +4 | -1

The correct order of electro chemical equivalent (e) of Sodium, Magnesium and Aluminium is

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Correct option: A

Na > Mg > Al

Option A is correct because the electrochemical equivalent (e) is directly proportional to the molar mass and inversely proportional to the number of electrons involved in the half-cell reaction. For Na, Mg, and Al, the molar masses are approximately 23, 24, and 27 g/mol, and the number of electrons involved are 1, 2, and 3, respectively. Therefore, the order of electrochemical equivalents is Na > Mg > Al.

133 Easy

133 of 138

Remembering +4 | -1

The laws of electrolysis ware proposed by

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Correct option: B

Faraday

Option B is correct because Michael Faraday proposed the laws of electrolysis.

134 Easy

134 of 138

Understanding +4 | -1

The electrolysis of a solution resulted in the formation of

{\mathrm{H}_2}

at the cathode and

\mathrm{C}{\mathrm{l}_2}

at the anode. The liquid is:

View answer and explanation

Correct option: C

\mathrm{NaCl}

solution in water

Option C (NaCl solution in water) is correct because electrolysis of NaCl(aq) produces H2 at the cathode and Cl2 at the anode.

135 Easy

135 of 138

Remembering +4 | -1

Anode in the Leclanche cell is

View answer and explanation

Correct option: B

Zinc container

Option B is correct because in a Leclanche cell (dry cell), the anode is the zinc container, which gets oxidized during the cell's operation.

Explore Other Chapters in CHEMISTRY

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CHEMICAL BONDING & MOLECULAR STRUCTURE 595 MCQs THERMODYNAMICS 583 MCQs STRUCTURE OF ATOM 499 MCQs CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 429 MCQs Equilibrium 412 MCQs STATES OF MATTER 410 MCQs

136 Easy

136 of 138

Understanding +4 | -1

In a galvanic cell, which is wrong?

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Correct option: C

Reduction takes place at anode

Option C (Reduction takes place at anode) is correct because reduction always occurs at the cathode, while oxidation occurs at the anode in a galvanic cell.

137 Easy

137 of 138

Understanding +4 | -1

Specific conductivity of a solution

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Correct option: B

Decreases with dilution

Option B (Decreases with dilution) is correct because specific conductivity is the conductance of a unit volume of solution, and the number of ions per unit volume decreases upon dilution.

138 Easy

138 of 138

Analyzing +4 | -1

Statement (S): Conductivity of weak electrolytic solution decreases with dilution whereas equivalent conductivity, molar conductivity increases with dilution.
Explanation (E): On dilution, the ionic mobility and number of ions present in solution increases but number of ions per mL decreases.

View answer and explanation

Correct option: C

Both S and E are correct and E is correct explanation of S.

Option C (Both S and E are correct and E is correct explanation of S) is correct because both the statement and explanation are true, and the explanation correctly describes why conductivity decreases while equivalent and molar conductivity increase with dilution.

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