Tag: metallic and electrolytic conduction

Questions Related to metallic and electrolytic conduction

The charge required to deposit 40.5 g of Al(atomic mass=27.0 g) from the fused ${ Al } _{ 2 }{ \left( { SO } _{ 4 } \right) } _{ 3 }$ is :

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. $4.34\times { 10 }^{ 5 }C$

  2. $43.4\times { 10 }^{ 5 }C$

  3. $1.44\times { 10 }^{ 5 }C$

  4. None of these

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Correct Option: A

Electrolytic conductivity of $0.3 M$ solution of $KCI$ at $298 K $is $3.72$ x ${10}^{-2}Scm^{-1}$.Calculate its molar conductivity ($S cm^{2} mol ^{-1}$) 

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. $124$

  2. $30.56$

  3. $192$

  4. $185$

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Correct Option: A
Explanation:

Given,

$k=3.72\times 10^{-2}\ Scm^{-1}$
$c=0.3M$

Molar conductivity($m$) is given by,

$m=\dfrac{k\times 1000}{c}$

$\Rightarrow m=\dfrac{3.72\times 10^{-2}\times 1000}{0.3}$

$\Rightarrow m=124\ S\ cm^2mol^{-1}$

Resistance of decimolar solution is 50 ohm. If electrodes of surface area 0.0004 $m^2$ each are placed at a distance of 0.02 m then conductivity of solution is : 

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. $1 \,s\,cm^{-1}$

  2. $0.01 \,s\,cm^{-1}$

  3. $0.001 \,s\,cm^{-1}$

  4. $10 \,s\,cm^{-1}$

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Correct Option: C

Which statement is not correct ?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. Conductance of an electrolytic solution increase with dilution

  2. Conductance of an electrolytic solution decrease with dilution

  3. specific conductance of an electrolytic solution decrease with dilution

  4. Equivalent conductance of an electrolytic solution increase with dilution

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Correct Option: C

Pure water consists almost entirely of:

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. molecules

  2. ions

  3. atoms

  4. ions and molecules

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Correct Option: A
Explanation:

Water has very low ionisation constant so it dissociates very low and pure water is consists almost entirely of molecules.

Molten potassium chloride conducts electricity due to the presence of  _______ .

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. free electron

  2. free ions

  3. free molecules

  4. atom of potassium & chloride

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Correct Option: B

Which of the following solid is an electronic conductor?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. $NaCl$

  2. Diamond

  3. $CuS$

  4. $KCl$

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Correct Option: C
Explanation:

Only CuS solid conducts electricity. NaCl and KCl are electrolytic conductor and diamond is non-conductor.

Hence, correct option is C.

We can expect that pure water:

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. will not normally conduct electricity

  2. will normally conduct electricity

  3. slightly conduct electricity

  4. completely conduct electricity

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Correct Option: A
Explanation:

Water has very low ionisation constant so it dissociates very low and pure water  consists almost entirely of molecules; as no of ions are very less in pure water so normally it will not conduct electricity.

Which modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle?

metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

  1. A.C. should be used

  2. A conductivity cell is used

  3. Galvanometer is replaced by magic eye or headphone arrangement

  4. All of the above

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Correct Option: D
Explanation:

All of the following modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle.


(A) A.C. should be used.
(B) A conductivity cell is used.
(C) The galvanometer is replaced by magic eye or headphone arrangement.

If D.C. is used, electrolyte solution will go electrolysis and the change in concentration during the passage of current will not allow reaching the steady value of the null point. In A.C. galvanometer does not work. Also to put the solution at one end in the gap of the meter bridge, a conductivity cell is needed.

Hence, the correct option is $D$

Assertion: Nickel is a metal and it conducts electricity through its valence shell electrons.
Reason: Nickel sulphate solution conducts electricity through its ions.
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: B
Explanation:

Nickel is a metal and it conducts electricity through its valence shell electrons while nickel sulphate solution conducts electricity through its ions (formed by dissociation of nickel sulphate solutions).