Electrochemistry MCQ Questions & Answers in Physical Chemistry | Chemistry
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211.
Electrode potential of the half cell $$Pt\left( s \right)\left| {Hg\left( l \right)} \right|H{g_2}C{l_2}\left( s \right)\left| {C{l^ - }\left( {aq} \right)} \right.$$ can be increased by :
212.
Fill in the blanks with appropriate words.
The electrolytic solution is always neutral because the total charge on $$\underline {\left( {\text{i}} \right)} $$ is equal to $$\underline {\left( {{\text{ii}}} \right)} $$ on $$\underline {\left( {{\text{iii}}} \right)} .$$ Unlike the metallic conductor, the electrolyte conducts the electric current by virtue of movement of its $$\underline {\left( {{\text{iv}}} \right)} .$$ The property due to which a metal tends to go into solution in term of positive ions is known as $$\underline {\left( {\text{v}} \right)} .$$
(i), (ii), (iii), (iv) and (v) respectively are
A
cations, partial charge, anions, electrons, reduction
B
cations, total charge, anions, ions, oxidation
C
cations, ionic charge, anions, atoms, dissolution
D
cations, partial charge, anions, molecules, electrolysis.
Answer :
cations, total charge, anions, ions, oxidation
No explanation is given for this question. Let's discuss the answer together.
213.
The specific conductance of a $$0.1$$ $$N$$ $$KCl$$ solution at $${23^ \circ }C$$ is $$0.012\,{\Omega ^{ - 1}}\,c{m^{ - 1}}.$$ The resistance of cell containing the solution at the same temperature was found to be $$55\,\Omega .$$ The cell constant will be
214.
What will be standard cell potential of galvanic cell with the following reaction?
$$2C{r_{\left( s \right)}} + 3Cd_{\left( {aq} \right)}^{2 + } \to 2Cr_{\left( {aq} \right)}^{3 + } + 3C{d_{\left( s \right)}}$$
$$\left[ {{\text{Given:}}\,E_{\frac{{C{r^{3 + }}}}{{Cr}}}^ \circ = - 0.74\,V\,\,{\text{and}}\,\,E_{\frac{{C{d^{2 + }}}}{{Cd}}}^ \circ = - 0.40\,V} \right]$$
217.
The standard reduction potentials of $$C{u^{2 + }}\left| {Cu\,{\text{and}}\,C{u^{2 + }}} \right|C{u^ + }$$ are $$0.337 V$$ and $$0.153$$ respectively. The standard electrode potential of $$C{u^ + }\left| {Cu\,} \right.$$ half cell is
218.
For the electrochemical cell
$$Pt\left( s \right)\mathop {\left| {{H_2}\left( g \right)} \right|}\limits_{1\,atm} {H^ + }\left( {1\,M} \right)\left| {,Cu\left( s \right)} \right.$$ which one of the following statements is true ?
A
$${H^ + }\,ions$$ are formed at anode and $$Cu$$ is deposited at cathode.
B
$${H_2}$$ is liberated at cathode and $$Cu$$ is deposited at anode.
C
Oxidation occurs at cathode.
D
Reduction occurs at anode.
Answer :
$${H^ + }\,ions$$ are formed at anode and $$Cu$$ is deposited at cathode.
219.
The standard electrode potentials $$\left( {E_{{M^ + }/M}^ \circ } \right)$$ of four metals $$A, B, C$$ and $$D$$ are $$ - 1.2\,V,0.6\,V,0.85\,V$$ and $$ - 0.76\,V,$$ respectively. The sequence of deposition of metals on applying potential is :
A
$$A,C,B,D$$
B
$$B,D,C,A$$
C
$$C,B,D,A$$
D
$$D,A,B,C$$
Answer :
$$C,B,D,A$$
As the value of reduction potential decreases the reducing power increases i.e.
$$\mathop C\limits_{\left( {0.85} \right).} < \mathop B\limits_{\left( {0.6} \right).} < \mathop D\limits_{\left( { - 0.76} \right)} < \mathop A\limits_{\left( { - 1.2} \right)} $$
220.
The specific conductivity of $$\frac{N}{{10}}KCl$$ solution at $${20^ \circ }C$$ is $$0.0212\,oh{m^{ - 1}}c{m^{ - 1}}$$ and the resistance of the cell containing this solution at $${20^ \circ }C$$ is $$55\,ohm.$$ The cell constant is