Tag: metallic and electrolytic conduction

Questions Related to metallic and electrolytic conduction

Which does not show electrical conductance?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Sodium

  2. Diamond

  3. Potassium

  4. Graphite

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Correct Option: B,D
Explanation:

Sodium, potassium and Graphite all three are electrical conductor except Diamond which is an insulator of electric current.

Which of the following will conduct electricity?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. distilled water

  2. potable water

  3. well water

  4. none of the above

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Correct Option: C
Explanation:

Well water conducts electricity due to the presence of ions.

Which of the following solutions contains the greatest number of ions assuming that each solute is fully ionized?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. $1$ cm$^{-3}$ of $0.2M$ ${Na} _{2}{SO} _{4}$

  2. $1$ cm$^{-3}$ of $0.2M$ $Ca{Cl} _{2}$

  3. $1$ cm$^{-3}$ of $0.2M$ $NaCl$

  4. $1$ cm$^{-3}$ of $0.2M$ ${Cr} _{2}{({SO} _{4})} _{3}$

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Correct Option: D
Explanation:

No. of ions in 11 molecule of $Na _2SO _4=3$ 

No. of ions in 11 molecule of $CaCl _2=3$
No. of ions in 11 molecule of $NaCl=2$
No. of ions in 11 molecule of $Cr _2(SO _4) _3=5$
As the molarity and volume is same for all the given substances, number of ions will be greatest for the compound having greatest number of ions in one molecule. Therefore, $Cr _2(SO _4) _3$ will have the greatest number of ions.

An electrolytic cell was set up. Water is placed in the cell and battery is switched on. The bulb is also connected through a battery. The bulb will:

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. glow.

  2. not glow.

  3. depends on the amount of water.

  4. None of the above.

Show answer
Correct Option: A
Explanation:

Water has some impurities in it. So the impurities will carry the current and the bulb will glow.

An electrolytic cell was set up. Ammonium hydroxide is placed in the cell and battery is switched on. The bulb is also connected through a battery. The bulb will:

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. glow brightly

  2. glow dimly

  3. not glow

  4. depends on the amount of ammonium hydroxide

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Correct Option: B
Explanation:

Ammonium hydroxide is a weak base so it has less ions to carry the current. So the circuit will be completed and the bulb will glow dimly.

The electrical conductivity of a solution depends upon :

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. its dilution

  2. its pressure

  3. the number of ions

  4. its temperature

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Correct Option: C

Which of the following is not a property of metallic conduction?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. The flow of electricity takes place by flow of electrons

  2. There is no decomposition of the parent metal

  3. Metals are good conductors of electricity in solid state and in the molten state

  4. None of the above

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Correct Option: D
Explanation:
The properties of metallic conduction are:
1. The flow of electricity takes place by a flow of electrons.
2. There is no decomposition of the parent metal
3. Metals are good conductors of electricity in solid state and in the molten state

Conduction of electricity takes place due to the presence of :

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. free atoms

  2. free ions

  3. molecules

  4. gas dissolved in water

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Correct Option: B
Explanation:

Conduction of electricity takes place due to the presence of free ions.

Which of the following sentences is/are true?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Electrolytic conduction involves chemical changes

  2. Metallic conduction does not involve chemical changes

  3. Both of the above

  4. None of the above

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Correct Option: C
Explanation:

Electrolytic conduction occurs when a voltage is applied across the electrodes dipped in the electrolytic solution. The ions present in the electrolyte moves. The cations move towards the cathode. In the cathode the cations undergo reduction. The anions move towards the anode. In the anode the anions undergo oxidation. Thus electrolytic conduction accompanies a chemical change.
But no such chemical change occurs in case of metallic conduction.

Assertion: A 0.2M solution of carbonic acid is a weaker conductor of electricity than a 0.2M solution of $HBr$.

Reason: In solutions with the same concentration of solute molecules, $H _2CO _3$ is less dissociated than $HBr$.

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. The Assertion and Reason are correct and Reason is the correct explanation of Assertion

  2. Both the Assertion and Reason are correct and Reason is NOT the correct explanation of Assertion

  3. The Assertion is correct but Reason is not correct

  4. The Assertion is not correct but Reason is correct

  5. Both the Assertion and Reason are not correct

Show answer
Correct Option: A
Explanation:

Option A is the correct answer.

$ {HBr} $ dissociates completely in a solution forming $ {H}^{+} $ and $ {Br}^{-} $ ions. Whereas, $ {H} _{2}{C}{O} _{3} $ partially dissociates in a solution forming $ {H}^{+} $ and $ {HCO} _{3}^{-} $ ions. Thus in the same concentration of both the acids $ {HBr} $  is a stronger acid than $ {H} _{2}{C}{O} _{3} $. 
As $ {HBr} $  dissociates completely,  $ {H}^{+} $ ion concentration is more in this case, and hence $ {HBr} $ is a good conductor of electricity.