What are galvanic cells? Explain the working of a galvanic cell with a neat sketch taking Daniel cell as example.

Galvanic cell: A device which converts chemical energy into electrical energy by the use of spontaneous redox reactions is called Galvanic cell or voltaic cell. E.g: Daniel cell. Daniel cell: It is a special type of galvanic cell. It contains two half cells in the same vessel. The vessel is divided into two chambers. Left chambers is filled with ZnSO 4 ( aq ) solution and Zn-rod is dipped into it. Right chamber is filled with CuSO 4 ( aq ) solution and copper rod is dipped into it. Process diaphragm acts as a salt bridge. The two half cells are connected to external battery. Cell reactions: Ion Zn / ZnSO 4 half cell, oxidation reaction occurs Zn → Zn 2 + + 2 e - Ion Cu / CuSO 4 half cell, reduction reaction occurs. Cu 2 + + 2 e - → Cu The net cell reaction is Zn + Cu 2 + ⇔ Zn 2 + + Cu Cell is represented as Zn / Zn 2 + ∥ Cu 2 + / Cu

A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is doubled?

Let the reaction be: A → products Let the concentration of the reactant A = x It is mentioned in the question that reaction is second order with respect to A reactant. So the rate r 1 = k A 2 = k x 2 If the concentration of reactant becomes double i.e. A = 2 x Then the rate of reaction would be r 2 = k 2 x 2 = 4 k x 2 = 4 r 1 Therefore the rate of reaction increases four times as concentration become double.

HARD

12th Andhra Pradesh Board

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Earn 100

Suggest a way to determine the ${λ^{o}}_{m}$ value of water.

Important Questions on Electrochemistry and Chemical Kinetics

HARD

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 7

The molar conductivity of

0.025 mol

methanoic acid is

46.1 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}

. Calculate its degree of dissociation. Given,

{λ^{0}}_{(H^{+})} = 349.6 S {cm}^{2} {mol}^{- 1} and λ^{0}_{({HCOO}^{-})} = 54.6 S {cm}^{2} {mol}^{- 1} .

HARD

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 8

State and explain Kohlrausch law of independent migration of ions. How is it useful to determine the molar conductivity of weak electrolytes at zero concentration?

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 9

Calculate the potential of hydrogen electrode in contact with a solution whose

p H

10 .

(Use T = 298 K, F = 96500, R = 8.314)

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 10

Arrange the following metals in the order in which they displace each other from the solution of their salts.

A l, C u, F e, M g

and

Z n

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 11

Given the standard electrode potentials,

K^{+} / K = - 2 .93 V

A g^{+} / A g = 0.80 V,

H g^{2 +} / H g = 0.79 V

M g^{2 +} / M g = - 2.37 V,

C r^{3 +} / C r = - 0.74 V

Arrange these metals in their increasing order of reducing power.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 12

Write the Nernst equation and calculate emf of the following cell at $298 K :$
$M g (s) |M g^{2 +} (0.001 M)| |C u^{2 +} (0.0001 M)| C u (s)$

(Given $E_{{Mg}^{+ 2} / Mg}^{\circ} = - 2.36, E_{{Cu}^{+ 2} / Cu}^{\circ} = 0.34$ )

EASY

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 13

What do you mean by reactive metals?

EASY

12th Andhra Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Electrochemistry and Chemical Kinetics>Exercise>Q 14

Predict whether zinc and silver react with

1 M

sulphuric acid to give out hydrogen gas or not. Given that the standard reduction potentials of zinc and silver are

- 0.76 volt

and

0.80 volt

respectively.

Suggest a way to determine the λom value of water.

Important Questions on Electrochemistry and Chemical Kinetics

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Suggest a way to determine the ${λ^{o}}_{m}$ value of water.