Tag: metallic and electrolytic conduction

Questions Related to metallic and electrolytic conduction

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

        




metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  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

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Correct Option: A

Which technique should be used to determine if a solution contains a molecular or ionic solute?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Conductivity

  2. Calorimetry

  3. Precipitation

  4. Spectophotometry

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Correct Option: A
Explanation:

The presence of ionic solute in a solution can be determined by measuring its conductivity because ions are good conductor of electricity.

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

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Reduction by carbon

  2. Electrolysis of ore

  3. A Roasting of ore in $O _2$

  4. Magnetic separation

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Correct Option: B

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?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Decreases

  2. Increases

  3. Remains unchanged

  4. First increase and then decrease

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Correct Option: A

Which of the following is/are always true electroplating ?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  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.

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

  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

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Correct Option: A
Explanation:

With increase of temperature the ionic mobility increases.

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) $[CoCl _2(NH _3) _]1Cl$ 

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. III > II > IV > I

  2. II > III > IV > I

  3. II > III > I > IV

  4. III > IV > II > I

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Correct Option: A
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 } $

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

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. shape of molecules

  2. size of its molecules

  3. size of solvent molecules

  4. extent of its ionisation

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Correct Option: D
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.

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?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Sodium chloride, $NaCl$

  2. Glucose, $C _{6}H _{12}O _{6}$

  3. Water, $H _{2}O$

  4. Ethanol, $C _{2}H _{5}OH$

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Correct Option: A
Explanation:

The electrolyte present in sports drink is sodium chloride.

Conductivity of aqueous solution of an electrolyte depends on:

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. molecular mass of the electrolyte

  2. boiling point of solvent

  3. degree of ionisation

  4. volume of the solvent

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Correct Option: C
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.