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12th Chemistry weekly Test - 4 ( Electro Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 4 ( Electro Chemistry )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

The equivalent conductivity of CH₃COOH at 25°C is 80 ohm^-1 cm2 eq^-1 and at infinite dilution 400 ohm^-1 cm2 eq^-1• The degree of dissociation of CH³COOH is

1
0.2
0.1
0.3

The process in which chemical change occurs on passing electricity is termed as_______

neutralisation
hydrolysis
electrolysis
ionisation

An example for 1: 1 electrolyte is

H₂SO₄
Na₂SO₄
NaCl
Al₂(SO₄)₃

The emf generated by an electrochemical cell is given by the symbol

E
M
F
S

Which of the statements about electrolytic conductance is not true?

Conductivity increases with decrease in viscosity.
Higher dielectric constant shows lower conductance in solution.
Temperature increases, conductance also increases.
Molar conductance increases with increase in dilution.

During electrolysis of molten sodium chloride, the time required to produce O.lmol of chlorine gas using a current of 3A is

55 minutes
107.2 minutes
220 minutes
330 minutes

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 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

When the emf of the cell is determined under standard conditions, it is called as

single electrode emf
standard emf
individual emf
half cell emf

According to Faraday's frrst law m = Zit, where Z is

reaction quotient
effective nuclear charge
atomic number
electrochemical equivalent

How many faradays of electricity are required for the following reaction to occur Mn\(O^{-}_{4}\) → Mn²⁺

5F
3F
1F
7F

1mho is equal to

1 siemen
1 second
1 ohm
none of the above

The electrode where there is loss of electron is called

cathode
anode
salt bridge
both (a) and (b)

Cell equation: A + 2B^-→ A²⁺ + 2B;
A²⁺ + 2e^- → A E° = + 0.34 V and log₁₀ K = 15.6at 300 K for cell reactions find E° for B⁺ + e^-→ B

0.80
1.26
-0.54
-10.94

Unit of resistivity is_______

ohm metre
siemen
sm^-1
mho

The laws of electrolysis were enunciated first by

Dalton
Faraday
Kekule
Avogadro

The electrical energy produced by a cell equals _______

\({ E }_{ Cathode }-{ E }_{ anode }\)
\(\frac { Charge\quad of\quad electrons }{ { E }_{ cell } } \)
\(Charge\quad of\quad electrons\quad\times { E }_{ cell }\)
\(\frac { { E }_{ cell } }{ Charge\quad of\quad electrons\quad } \)

Calculate the standard emf of the cell, provided the standard reduction potentials of cathode and anode are -0.763 V and 0.80V.

- 1.563 V
0.037V
- 0.610 V
None of these

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

The inert electrode is__________

Cu
Pt
Zn
None of these

The zinc - copper cell has emf of______

1V
2.1V
1.1 V
-1.1 V

________is the reciprocal of resistance.

specific conductance
molar conductance
specific resistance
conductance

\({ \lambda }_{ c }={ \mu }_{ c }\) for,

NaCl
H₂SO₄
Na₂SO₄
Al₂(SO₄)₃

Using the data given below find out the strongest reducing agent

\({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ ° }{ Cr }^{ 3+ }=1.33V,\quad { E }_{ { Cl }_{ 2 }{ Cl }^{ - } }^{ ° }=1.36V\)

\({ E }_{ Mn{ O }_{ 4 }^{ - } }^{ ° }{ /Mn }^{ 2+ }=1.51V,\quad { E }_{ { Cr }^{ 3+ }/Cr }^{ ° }=-0.74V\)

Cr
Cr³⁺
Cl^-
Mn²⁺

In the electrochemical cell: Zn | ZnSO₄ (0.01 M) || CuSO₄ (1.0 M) | Cu, the emf of this Daniel cell is E₁. When the concentration of ZNSO₄ is changed to 1.0 M and that CuSO₄ changed to 0.01M, the emf changes to E₂. From the followings, which one is the relationship between E₁ and E₂?

E₁ < E₂
E₁ > E₂
E₂ = 0 ≤ E₁
E₁ = E₂

When a zinc metal strip is placed in a copper sulphate solution the blue colour of the solution fades and copper is deposited on the zinc strip as red - brown crust. The oxidation half cell reaction of the above process is represented as_____

\({ Cu }_{ (aq) }^{ 2+ }+{ 2e }^{ - }\longrightarrow { Cu }_{ (s) }\)
\({ Cu }_{ (s) }\longrightarrow { Cu }^{ 2+ }+{ 2e }^{ - }\)
\(Zn_{ (s) }\longrightarrow { Zn }_{ (aq) }^{ 2+ }+{ 2e }^{ - }\)
\({ Zn }_{ (aq) }^{ 2+ }+{ 2e }^{ - }\longrightarrow { Zn }_{ (s) }\)

The reciprocal of specific resistance is called ______.

conductance
specific conductance
conductivity
both (b) and (c)

The electrochemical process is carried out in a device called______

cell
cathode
anode
electrode

1F equals to ________

96500 moles
96500 C
1.6 x 10^-19 C
1.6 x 10^-19 moles

The number of electrons delivered at the cathode during electrolysis by a current of 1A in 60 seconds is :
(charge of electron = 1.6 x 10-19C)

6.22 x 10²³
6.022 x 10²⁰
3.75 x 10²⁰
7.48 x 10²³

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