Tag: metallic and electrolytic conduction

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Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

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 :

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction is Al^3+ + 3e- -> Al. 1 mole of Al (27g) requires 3 Faradays (3 * 96500 C). For 40.5g, the moles of Al = 40.5 / 27 = 1.5 moles. Charge = 1.5 * 3 * 96500 = 4.5 * 96500 = 434250 C, which is 4.34 * 10^5 C.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

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

  1. $124$
  2. $30.56$
  3. $192$
  4. $185$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Given,

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

Molar conductivity($m$) is given by,

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

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

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

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

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 : 

  1. $1 \,s\,cm^{-1}$
  2. $0.01 \,s\,cm^{-1}$
  3. $0.001 \,s\,cm^{-1}$
  4. $10 \,s\,cm^{-1}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conductivity k = (1 / R) * (l / A). Resistance R = 50 ohm, distance l = 0.02 m = 2 cm, area A = 0.0004 m^2 = 4 cm^2. Thus k = (1 / 50) * (2 / 4) = 0.02 * 0.5 = 0.01 S cm^-1.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

Which statement is not correct ?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Specific conductance (kappa) decreases with dilution because the number of ions per unit volume decreases. Conductance and equivalent conductance increase with dilution because the total number of ions or the mobility of ions increases.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

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

  1. free electron

  2. free ions

  3. free molecules

  4. atom of potassium & chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ionic compounds like potassium chloride (KCl) conduct electricity in the molten state because the crystal lattice breaks down, allowing the K+ and Cl- ions to move freely.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

We can expect that pure water:

  1. will not normally conduct electricity

  2. will normally conduct electricity

  3. slightly conduct electricity

  4. completely conduct electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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 $D$

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry
Assertion: Nickel is a metal and it conducts electricity through its valence shell electrons.
Reason: Nickel sulphate solution conducts electricity through its ions.

  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
B Correct answer
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).