Tag: metallic and electrolytic conduction

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Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Given below are the half cell reactions

${ Mn }^{ 2+ }+{ 2e }^{ - }\longrightarrow { Mn }  E=-1.81V$

$2\left( { Mn }^{ 3+ }+{ e }^{ - }\longrightarrow { Mn }^{ 2+ } \right) E=+1.51V$ will be

        




  1. 0.33V ; the reaction will not occur .

  2. 0.33V ; the reaction will occur.

  3. 2.69V ; the reaction will not occur.

  4. 2.69V ; the reaction will occur
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To find the cell potential, we combine the half-reactions. The overall reaction is 3Mn^2+ -> Mn + 2Mn^3+. The E_cell = E_cathode - E_anode. Using the given values, E_cell = 1.51 - 1.81 = -0.30V. Since E is negative, the reaction is non-spontaneous.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

The first step in the extraction of Cu from copper pyrites is?

  1. Reduction by carbon

  2. Electrolysis of ore
  3. A Roasting of ore in $O _2$

  4. Magnetic separation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Copper pyrites (CuFeS2) contain iron and copper sulfides. The initial step in extracting copper from copper pyrites is roasting the ore in the presence of oxygen to remove excess sulfur as sulfur dioxide and convert iron sulfide into iron oxide.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Conductivity ($\kappa $) of $0.01M$ $NaCl$ solution is $0.000145S$ ${cm}^{-1}$. What happens to the conductivity if extra $100mL$ of ${H} _{2}O$ be added to the above solution?

  1. Decreases

  2. Increases

  3. Remains unchanged

  4. First increase and then decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Conductivity (kappa) is defined as the conductance of a solution contained between two electrodes of unit area and unit distance apart. Adding water (dilution) decreases the number of ions per unit volume, thus decreasing the conductivity.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Which of the following is/are always true electroplating ?

  1. Copper is used as cathode

  2. Cathode always gins weight while anode always loses weight

  3. Iron is coated with nickel or chromium to prevent from rusting.

  4. Ammeter reading during. electroplating steadily decreases.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In electroplating, the object to be plated is the cathode. While the cathode gains weight, the anode only loses weight if it is made of the metal being plated (sacrificial anode). Option A is the most general correct statement regarding the setup.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry
Assertion: The conductance of electrolyte solution increases with temperature.
Reason: With increase of temperature the ionic mobility increases.

  1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion

  2. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  3. Assertion is true but Reason is false

  4. Assertion is false but Reason is true

  5. Both Assertion and Reason are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

With increase of temperature the ionic mobility increases.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Arrange the following complexes in order of increasing electrical conductivity.
(I) $[CoCl _3(NH _3) _3]$     (II) $[CoCl(NH _3) _5]CI _2$
(III) $[Co(NH _3) _6]Cl _3$   (IV) $[CoCl _2(NH _3) _]1Cl$ 

  1. III > II > IV > I

  2. II > III > IV > I

  3. II > III > I > IV

  4. III > IV > II > I
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrical conductivity $\times $ no. / moles of ions present after dissociation.

$I$ $\therefore \quad \left[ Co{ Cl } _{ 3 }{ \left( { NH } _{ 3 } \right)  } _{ 3 } \right] $
$II$  $\left[ CoCl{ \left( { NH } _{ 3 } \right)  } _{ 5 } \right] { Cl } _{ 2 }\rightarrow { \left[ CoCl{ \left( { NH } _{ 3 } \right)  } _{ 5 } \right]  }^{ 2+ }+2{ Cl }^{ \left( - \right)  }$
$IV$  $\left[ Co{ Cl } _{ 2 }{ \left( { NH } _{ 3 } \right)  } _{ 4 } \right] Cl\rightarrow { \left[ Co{ Cl } _{ 2 }{ \left( { NH } _{ 3 } \right)  } _{ 4 } \right]  }^{ + }+{ Cl }^{ \left( - \right)  }$
$III$  ${ \left[ Co{ \left( { NH } _{ 3 } \right)  } _{ 6 } \right] Cl } _{ 3 }\rightarrow { \left[ Co{ \left( { NH } _{ 3 } \right)  } _{ 6 } \right]  }^{ 3+ }+3{ Cl }^{ \left( - \right)  }$
Hence the correct answer is,
$\boxed { III>II>IV>I } $

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

The electric conduction of a salt solution in water depends on the:

  1. shape of molecules

  2. size of its molecules

  3. size of solvent molecules

  4. extent of its ionisation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Higher the number of ions in solution, higher would be the conductivity of the solution as the number of charge carriers would increase. Hence, higher the degree of ionization greater would be the number of ions in solution.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Kim Istry was tired and thirsty after her soccer game, so she drank a sports drink that contained electrolytes. Kim is smart girl who known that when electrolytes dissolve in water, they produce solutions that can conduct an electric current. She also knows that the type of bonding in a substance can determined whether or not it is an electrolyte.
Which of the following substances is classified as an electrolyte?

  1. Sodium chloride, $NaCl$
  2. Glucose, $C _{6}H _{12}O _{6}$
  3. Water, $H _{2}O$
  4. Ethanol, $C _{2}H _{5}OH$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The electrolyte present in sports drink is sodium chloride.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Conductivity of aqueous solution of an electrolyte depends on:

  1. molecular mass of the electrolyte

  2. boiling point of solvent

  3. degree of ionisation

  4. volume of the solvent
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Conductivity of an aqueous solution depends on degree of ionization of solute. More is the degree of ionization more will be conductivity. Second, important factor on which conductivity depend is temperature.