Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Sample Paper>Q 57

MEDIUM

12th CBSE

IMPORTANT

Earn 100

In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, $Ni$ or $Zn$ ? Why? (Given standard electrode potentials of $Ni, Fe$ and $Zn$ are $- 0.25 V, - 0.44 V$ and $- 0.76 V$ respectively.)

Important Questions on Electrochemistry

MEDIUM

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 1

Why can limiting molar conductivity of

{CH}_{3} COOH

not be determined experimentally ?

HARD

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 2

Molar conductivities at infinite dilution for

{NH}_{4} Cl

,

NaOH

and

NaCl

solution at

298 K

are

129.8

,

217.4

and

108.9 S {cm}^{2} {mol}^{- 1}

, respectively and the molar conductivity of a

10^{- 2} M

solution of

{NH}_{4} OH

is

9.33 S {cm}^{2} {mol}^{- 1}

. Suggest how this information may be used to calculate the degree of dissociation of

{NH}_{4} OH

?

EASY

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 3

What advantage do the fuel cells have over primary and secondary batteries?

HARD

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 4

Sketch and describe the operation of $H_{2} - O_{2}$ fuel cell.

HARD

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 5

What are the advantages and disadvantages of fuel cells?

EASY

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 6

Can you store copper sulphate solutions in a zinc pot?

HARD

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 7

The number of electrons that have a total charge of

965

coulombs is

HARD

12th CBSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Electrochemistry>Exercise>Q 8

Calculate the emf of the cell in which the following reaction takes place:

N i (s) + 2 A g^{+} (0.002 M) \to N i^{2 +} (0.160 M) + 2 A g (s)

Given that

E_{(c e l l)}^{⊝} = 1.05 V