Tag: metallic and electrolytic conduction

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Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

On increasing temperature, the conduction in metallic conductors :

  1. increases

  2. decreases

  3. remains constant

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Increasing the temperature will inhibit conduction in a metallic conductors because the increased thermal motions of the electrons will tend to interfere with their regular flow in an electric current.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

The molar conductivity of cation and anion of salt $BA$ are $180$ and $220\ mhos\ cm^{2} mol^{-2}$ respectively. The molar conductivity of $BA$ at infinite dilution is:

  1. $90\ mhos \ cm^{2} mol^{-1}$
  2. $110\ mhos \ cm^{2} mol^{-1}$
  3. $400\ mhos \ cm^{2} mol^{-1}$
  4. $200\ mhos \ cm^{2} mol^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Molar conductivity at infinite dilution is the sum of the limiting molar conductivities of the cation and anion. For salt BA, we add the cation conductivity (180) and anion conductivity (220) to get 400 mhos cm² mol⁻¹. This additive property holds because at infinite dilution, ions behave independently without interionic interactions. The unit should be mol⁻¹, not mol⁻² as written in the question (a minor typographical error that doesn't affect the calculation).

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

A solution containing one mole per litre of each $Cu(NO _3) _2$, $AgNO _3, Hg _2(NO _3) _2$ and $Mg(NO _3) _2$ is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts(reduction potential) are.
$Ag^+/Ag=+0.80, Hg^{2+} _2/2Hg =+0.79$
$Cu^{2+}/Cu=+0.34, Mg^{2+}/Mg =-2.37$
With increasing voltage, the sequence of deposition of metals on the cathode will be:

  1. Ag, Hg, Cu, Mg

  2. Mg, Cu, Hg, Ag

  3. Ag, Hg, Cu

  4. Cu, Hg, Ag
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

 The standard electrode potentials ${\text{E}} _{{{\text{I}} _2}/{1^ - }}^ \circ ,{\text{E}} _{{\text{B}}{{\text{r}}^ - }/{\text{B}}{{\text{r}} _2}}^ \circ $ and ${\text{E}} _{{\text{Fe/F}}{{\text{e}}^{2 + }}}^ \circ $ are respectively $ + 0.54{\text{V,}} - 1.09{\text{V}}$ and 0.44 V. On the basis of the above data which of the following process is nonspontaneous?

  1. ${\text{B}}{{\text{r}} _2} + 2{{\text{I}}^ - }\;{\text{2B}}{{\text{r}}^ - } + {{\text{I}} _2}{\text{ }}$
  2. ${\text{Fe}} + {\text{B}}{{\text{r}} _2}\;{\text{F}}{{\text{e}}^{2 + }} + 2{\text{B}}{{\text{r}}^ - }$
  3. ${\text{Fe}} + {{\text{I}} _2}{\text{ F}}{{\text{e}}^{2 + }} + 2{{\text{I}}^ - }$
  4. ${{\text{I}} _2} + 2{\text{B}}{{\text{r}}^ - }2{{\text{I}}^ - } + {\text{B}}{{\text{r}} _2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

the one which is having higher oxidation potential will undergo oxidation,

in D, $I^-$ is having lower reduction potential in comparison to $Br^-$, so has to undergo oxidation but in option D, it is getting oxidized.
hence, it is a nonspontaneous reaction.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

An alkali which dissociates partially on passage of an electric current is:

  1. sodium hydroxide

  2. nickel metal

  3. ammonium hydroxide

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

We have,

Sodium chloride is an ionic compound which is already present in the ionic form and completely dissociated on the passage of electric current,
Nickel and copper metal have higher reduction potential so, reduction takes place on passage of electric current,
ammonium hydroxide is a weak base it is partially dissociated on the passage of electric current.