Class 12 Chemistry
Electrochemistry
Question1.
The molar conductivity of a 1.8M solution of an electrolyte is found to be 103.7Scm2mol-1. Calculate the conductivity of its solutions.
Question2.
Define molar conductance and limiting molar conductivity.
Question3.
What would be the Variation of conductivity and molar conductivity with concentration?
Question4.
A cell reaction would be spontaneous if the cell potential and 𝚫rG are respectively.
(a) Positive and negative
(b) Negative, negative
(c) Zero,zero
(d) Positive, zero
Question5.
When two half- cells of electrode potential of E1 and E2 are combined to form a half cell of electrode potential E3, then
(When n1, n2 and n3 are no. of electrons exchanged in first second and combined half-cells).
Question6.
What is law of independent migration of ion?
Question7.
A person is performing an experiment of cell potential and got some interesting values of 𝚫G = -193 KJ/mol and n = 2. Calculate the cell potential (in V) for him.
Question8.
State Faraday’s law of electrolysis.
Question9.
How many hours does it take to reduce 3 mol Fe3+ to Fe2+ with 2 ampere current?
(F = 96500 coulomb)
Question10.
What is the role of platinum in hydrogen electrode?
Question11.
The electrical resistance of a thick vertical column of 0.10M KOH solution of diameter 1.5cm and length 75cm is 2.5 × 103 ohm. Calculate its resistivity, conductivity and molar conductivity.
(Given area of Vertical column is 0.922 cm2)
Question12.
For the reaction.
2AgCl(s) + H2(g) à 2Ag(s) + 2H+(0.1M) + 2Cl- (0.1M)
𝚫G0 = -43600J at 250C
Calculate the emf of the cell.
[log10-n = -n]
Question13.
HNO3(aq) is titrated with NaOH conductometrically, graphical representation of titration is
Question14.
A metal that forms self – protecting film of oxide to prevent corrosion is :
(a) Na
(b) Al
(c) Cu
(d) Au
Question15.
Define electrochemical cell. What happens if external potential applied becomes
greater than E0cell of the electrochemical cell.
Question16.
Calculate EMF of the cell,
Zn(s) ӏ Zn2+ (0.01M) ӏӏ Cd2+(0.01M) ӏ Cd(s)
E0Zn2+/zn = - 0.76 V ; E0Cd2+/cd = -0.40V
Question17.
The temperature coefficient of a cell whose operation is based on the reaction.
Calculate the change in entropy ( in J/K mol) during the operation.
Question18.
Match the following units –
(a) Conductance - Sm-1(equiv L-1)-1
(B) Molar conductance – Sm2mol-1
(c) Resistivity – cm-1
(d) Equivalent conductance – S
(e) Cell constant – Ohm m
Question19.
Silver is electro-deposited on a metallic vessel of total surface area 900cm2 by using a
current of 0.5 ampfor 2 hrs. calculate the thickness of silver deposited. Density of silver =
10.5gcm-3
(Atomic mass of silver =108amu, 1F = 96500C)
Question20.
Which of the following fluoride is used as rat poison?
(a) CaF2
(b) KF
(c) NaF
(d) MgF2
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