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Published on: 26/08/2019
Electrochemistry
Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
What does the negative sign in expression EoZn2+/Zn =-0.76 V mean?
2.
Under what condition os Ecell = 0 or \({ \triangle }_{ r }{ G }\) = 0?
3.
Can Eocell or \({ \triangle }_{ r }{ G }^{ o }\) for a cell reaction ever be equal to zero?
4.
Can absolute electrode potential of an electrode be measured?
5.
Which one of the following statement is always true about the spontaneous cell reaction in a galvanic cell?
\({ E_{ cell } }^{ ° }>0,{ \Delta G }^{ ° }>0,Q>{ K }_{ c }\)
\({ E_{ cell } }^{ ° }<0,{ \Delta G }^{ ° }<0,Q<{ K }_{ c }\)
\({ E_{ cell } }^{ ° }>0,{ \Delta G }^{ ° }<0,Q<{ K }_{ c }\)
\({ E_{ cell } }^{ ° }>0,{ \Delta G }^{ ° }<0,Q>{ K }_{ c }\)
6.
Among the following cells
Leclanche cell (I), Nickel-cadmium cell (II), Lead storage battery (III), Mercury cell (IV), primary cells are
I and II
I and III
II and III
I and IV
7.
For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25°C. The value of standard Gibbs energy, \({ \Delta G }^{ ° }\) will be (F = 96500 C mol-1)
- 98.0 kJ
- 89.0 kJ
- 89.0 J
- 44.5 kJ
8.
What will be the e.m.f of the given cell ? Pt | H2 (P1) | H+ (aq) | H2 (P2) | Pt
\(\frac { RT }{ F } In\frac { { P }_{ 1 } }{ { P }_{ 2 } } \)
\(\frac { RT }{ 2F } In\frac { { P }_{ 1 } }{ { P }_{ 2 } } \)
\(\frac { RT }{ F } In\frac { { P }_{ 2 } }{ { P }_{ 1} } \)
none of these
9.
If Zn2+ / Zn electrode is diluted 100 times, then the change in emf is
increase of 59 mV
decrease of 59 mV
increase of 29.5 mV
decrease of 29.5 mV
10.
A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y- and 1M Z- ions at 25°C . If the reduction potential of Z > Y > X, then
Y will oxidize X but not Z
Y will oxidize both X and Z
Y will oxidize Z but not X
Y will reduce both X and Z
11.
Standard electrode potential of three metals X, Y and Z are -1.2 V, + 0.5 v and - 3.0 V respectively. The reducing power of these metals will be
X > Y > Z
Y > Z > X
Y > X > Z
Z > X > Y
12.
Electrode potential of any electrode depends on :
nature of the metal
temperature of the solution
molarity of the solution
all of these
13.
Unit of ionic mobility is
m2 sec-1 volt-1
m s-1
m sec-1 volt
m sec-1 volt-1
14.
A dilute aqueous solution of Na2 SO4 is electrolysed using platinum electrodes. The products at the anode and cathode are
O2 , H2
SO2 , Na
O2 , Na
S2 O82- , H2
15.
Rusting
16.
Lead storage battery
17.
Ecell
1.
It means zinc is more reactive than hydrogen, therefore, acts as anode when coupled to S.H.E and gets oxidised to Zn2+ (aq) and H+ will get reduced to H2 (g).
2.
At the stage of chemical equilibrium in the cell.
3.
No but \(\mathrm{E}_{\text {cell }} \text { or } \triangle_r G^o\) of reaction can be zero at equilibrium.
4.
No, because electrode potential of a single electron cannot be mentioned.
5.
(c)
\({ E_{ cell } }^{ ° }>0,{ \Delta G }^{ ° }<0,Q<{ K }_{ c }\)
6.
(d)
I and IV
7.
(b)
- 89.0 kJ
8.
(b)
\(\frac { RT }{ 2F } In\frac { { P }_{ 1 } }{ { P }_{ 2 } } \)
9.
(b)
decrease of 59 mV
10.
Reduction potentials in the order Z > Y > X means that Z can be reduced most easily and X least easily, i.e., their oxidizing powers are : Z > Y > X.
Thus, Y will oxidize X but not Z.
11.
(d)
Z > X > Y
12.
(d)
all of these
13.
(a)
m2 sec-1 volt-1
14.
(a)
O2 , H2
15.
( )
prevented by galvanisation
16.
( )
Pb is anode, PbSO4 is cathode
17.
( )
V
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