Electrochemistry  MCQs

MCQs of Electrochemistry

Showing 111 to 120 out of 158 Questions
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111.
What is obtained at anode and cathode respectively when dilute aqueous solution of Na2SO4 is electrolyzed between Pt-electrodes ?
(a) O2, H2
(b) S2 O82-, Na
(c) O2, Na
(d) S2 O82-, H2
Answer:

Option (a)

112.
In a cell reaction, exchange of 2 mole e- is associated. If E°cell = 0.296 V, what will be the value of equilibrium constant at 25°C ?
(a) 10
(b) 1 × 1010
(c) 1 × 10-10
(d) 2.96 × 10-2
Answer:

Option (b)

113.
On what does the product of electrolytic cell not depend ?
(a) Nature of solvent
(b) Temperature
(c) Nature of electrode
(d) Concentration of solution
Answer:

Option (c)

114.
Which of the following products is obtained during electrolysis of concentrated solution of NaCl in presence of graphite's inert electrode.
(a) At anode Cl2(g) at cathode H2(g) and in solution NaOH.
(b) At anode Cl2(g) at cathode Na(s) and in solution NaOH.
(c) At anode O2(g) at cathode H2(g).
(d) At anode H2(g) at cathode Cl2(g) and in solution NaOH.
Answer:

Option (a)

115.
The correct formula to calculate efficiency of fuel cell is _____ .
(a) ∆G∆S
(b) ∆G∆H
(c) ∆S∆G
(d) ∆H∆G
Answer:

Option (b)

116.
Which substance is reduced in dry cell ?
(a) MnO2
(b) KMnO4
(c) NH4Cl
(d) ZnCl2
Answer:

Option (a)

117.
The electrical paste filled in mercury cell is prepared from ______ .
(a) Zn-Hg and HgO
(b) KOH and ZnO
(c) HgO and ZnO
(d) KOH and Zn-Ag
Answer:

Option (b)

118.
On which of the following does the conductivity of a solution depend ?
(a) Dilution of solution
(b) Number of ions
(c) Density of electric current
(d) Volume of solution
Answer:

Option (b)

119.
Which of the following statements is not correct ?
(a) Specific conductivity decreases when the electrolytic solution is diluted.
(b) Conductivity increases on dilution of the electrolytic solution.
(c) Equivalent conductivity increases on dilution of the electrolytic solution.
(d) Conductivity decreases on dilution of the electrolytic solution.
Answer:

Option (d)

120.
Select the correct ascending order of ionic mobility from the following.
(a) I- < Br- < Cl- < F-
(b) F- < Cl- < Br- < I-
(c) F- < I- < Cl- < Br-
(d) F- < Cl- < I- < Br-
Answer:

Option (a)

Showing 111 to 120 out of 158 Questions
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