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12th Chemistry Weekly Test - 1 ( Electro Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Weekly Test - 1 ( Electro Chemistry ) -Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

For the given cell \({ Cr }_{ (s) }\left| { Cr }_{ (aq) }^{ 3+ } \right| \left| { Cu }_{ (aq) }^{ 2+ } \right| { Cu }_{ (s) }\) which is correct?

Cr is the anode
Cu is the anode
Overall cell reaction is

\({ 2Cr }_{ (aq) }^{ 3+ }+{ 3Cu }_{ (s) }\longrightarrow { 2Cr }_{ (s) }+{ 3Cu }_{ (aq) }^{ 2+ }\)
Both (b) and (c)

NH₄OH is a weak base because
it has low vapour pressure

it is only partially ionised

it is completely ionised

it has low density
The molar conductivity of a 0.5 mol dm^-3 solution of AgNO₃ with electrolytic conductivity of 5.76 x 10^-3 S cm^-1 at 298 K is
2.88 S cm² mol^-1

11.52 S cm²mol^-1

0.086 S cm²mol^-1

28.8 S cm² mol^-1

A gas X at 1 atm is bubble through a solution containing a mixture of 1MY^- and 1MZ^- at 25°C. If the reduction potential of Z > Y > X, then

Y will oxidize X and not Z
Y will oxidize Z and not X
.y will oxidize both X and Z
Y will reduce both X and Z

The relationship between equilibrium constant and standard emf of a cell is

E^o= 0.0591 log K
0.0591 E^o = log K
nE^o = 0.0951 log K
nE^o = 0.0591 log K

Consider the following half cell reactions:
Mn²⁺ + 2e^-→ Mn E° = -1.18V
Mn²⁺→ Mn³⁺ + e^- E° = -1.51V
The E° for the reaction
3Mn²⁺→ Mn + 2Mn³⁺, and the possibility of the forward reaction are respectively.

2.69V and spontaneous
-2.69 and non spontaneous
0.33V and Spontaneous
4.18V and non spontaneous

The electrode where there is gain of electrons is called

cathode
anode
electrode
both (b) and (c)

The cathode in Leclanche cell is _______

Zinc container
Spongy lead
Graphite rod in contact with MnO₂
HgO mixed with graphite

Low molar conductivity at high concentration is due to_______

High attractive force between oppositively charged ions
Viscous drag due to greater solvation
Both (a) and (b)
Neither (a) nor (b)

The maximum work that can be derived from a chemical reaction is

\(W_{ max }=\triangle H\)
\(W_{ max }=\triangle G\)
\(W_{ max }=\triangle E\)
\(W_{ max }=\triangle S\)

The quantity of charge required to obtain 1 mole of aluminum from Al₂O₃ is_______

2F
3F
6F
12F

Part - B

Generic 2 - Answer All Question

What is standard reduction potential E^o?

Arrange the following solutions in the decreasing order of specific conductance.
i) 0.01 M KCl ii) 0.005 M KCl iii) 0.1 M KCl iv) 0.25 M KCl v) 0.5 M KCl

Define resistivity.
Give the empirical relationship between molar conductance and concentration of the electrolyte.

Define resistance. Give its mathematical expression.

What is a fuel cell?

Part - C

Generic 3 - Answer All Question

The standard reduction potential of Fe³⁺, Fe²⁺ I Pt is + 0. 771 V. This half cell is connected with another half cell such that emf of the cell is 0. 771 V. What is the other half cell?

What are the types of changes in the cathode and anode in electrolytic and electrochemical cells?
What is salt bridge? How is it represented in a cell diagram?

Corrosion of aluminum takes place at a much slower rate than iron. Give reason.

0.1 M ·solution of two electrolytes P and Q have specific conductance 4 x I0^-4 S cm^-1 and 6 x I0^-6 S cm^-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.

Write the reactions taking place in anode and cathode of a mercury button cell. Give the over all redox reaction of the cell with the emf generation .

Part - D

Generic 5 - Answer All Question

Write the electrochemical mechanism of corrosion.
Write an account on cell terminology.

Derive a relationship between dissociation constant K_a and molar conductivity \({ \Lambda }_{ m }\).

Explain SHE as a reference electrode.

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