Q. A new galvanic cell of E^u more than E°dl of Daniel cell is connected to Daniel cell in a manner that new cell gives electrons to cathode, what will happen
-
(A)
Ecell will increase
-
(B)
Ecell will decrease
-
(C)
No change will take place
-
(D)
Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod.
✅ Correct Answer: (D)
Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod.
Q. Ag+(aq) + e– → Ag(s) E° = + 0.80 V
Fe2+(aq)+ + 2e– → Fe(s) E° = – 0.44 V
What is emf of
Fe(s) + 2Ag+(aq) → Fe2+(aq) + 2Ag(s)
-
(A)
1.16 V
-
(B)
1.24 V
-
(C)
2.04 V
-
(D)
-1.16 V
✅ Correct Answer: (B)
1.24 V
Q. A conductivity cell containing electrodes made up of
-
(A)
Gold
-
(B)
Silver
-
(C)
Platinised platinum
-
(D)
Copper
✅ Correct Answer: (C)
Platinised platinum
Q. What is pH of the half cell Pt|H2fe)|H+ if E∘H+H2 =-0.0295 V
-
(A)
0.5
-
(B)
1
-
(C)
2
-
(D)
3
✅ Correct Answer: (A)
0.5
Q. What is the value of ‘K’ for below reaction?
-
(A)
1 × 108
-
(B)
1 × 102
-
(C)
4 × 103
-
(D)
3 × 104
✅ Correct Answer: (B)
1 × 102
Q. Which of the following statement is correct?
-
(A)
ECell and ∆rG of cell reaction both are extensive properties
-
(B)
ECell and ∆rG of cell reaction both are . intensive properties.
-
(C)
ECell is an intensive property while ∆rG of cell reaction is an extensive property.
-
(D)
ECell is an extensive property while ∆rG of cell reaction is an intensive property.
✅ Correct Answer: (C)
ECell is an intensive property while ∆rG of cell reaction is an extensive property.
Q. While charging the lead storage battery _________ .
-
(A)
PbSO4 anode is reduced to Pb.
-
(B)
PbSO4 cathode is reduced to Pb.
-
(C)
PbSO4 cathode is oxidised to Pb.
-
(D)
PbSO4 anode is oxidised to PbO2.
✅ Correct Answer: (A)
PbSO4 anode is reduced to Pb.
Q. The standard emf of a galvanic cell involving cell reaction with n = 2 is formed to be 0.295 V at 25° C. The equilibrium constant of the reaction would be
-
(A)
1.0 × 1010
-
(B)
2.0 × 1011
-
(C)
4.0 × 1012
-
(D)
1.0 × 102
✅ Correct Answer: (A)
1.0 × 1010
Q. The emf of the cell:
Ni / Ni2+ (1.0 M) // Au3+ (1.0 M) / Au (E° = -0.25 V for Ni2+/Ni; E° = 1.5 V for Au3+/Au) is
-
(A)
1.25 V
-
(B)
-1.25 V
-
(C)
1.75 V
-
(D)
2.0 V
✅ Correct Answer: (C)
1.75 V
Q. The reaction, 3ClO– (aq) → ClO3 (aq) + 2Cl– (aq) is an example of
-
(A)
Oxidation reaction
-
(B)
Reduction reaction
-
(C)
Disproportionation reaction
-
(D)
Decomposition reaction
✅ Correct Answer: (C)
Disproportionation reaction
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