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Retro (Past 13 Year) JEE Main (Electrochemistry)


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29 Questions MCQ Test Chemistry for JEE Advanced | Retro (Past 13 Year) JEE Main (Electrochemistry)

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Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 1

Only One Option Correct Type

This section contains 29 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Two Faraday of electricity is passed through a solution of CuSO4. The mass of copper deposited at the cathode is (atomic mass of Cu = 63.5 amu)

(JEE Main 2015)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 1


Cu formed by two Faraday =
1 mole = 63.5 g

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 2

Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.4 Sm-1. The resistance of 0.5 M solution of the same electrolyte is 280 Ω The molar conductivity of 0.5 Msolution of the electrolyte in S mol-1 is

(JEE Main 2014)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 2


The resistivity of the solution is related to specific conductance by



The specific conductance of the solution is given by

Now, the molar conductivity of the solution is given by 

Hence, the molar conductivity of 0.5 M solution of the electrolyte is 5 x 10 -4 S m2 mol-1.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 3

The equivalent conductance of NaCI at concentration C and at infinite dilution are λc and λ respectively. The correct relationship between λc and λ is given as

(JEE Main 2014)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 3

Debye-Huckel Onsager equation can be written as

Where,

λc = Molar conductivity of the solution at certain concentration 
λ = Limiting molar conductivity
C = Concentration
B = Constant that depends on temperature, charges on the ions and dielectric constant as well as viscosity of the solution
 

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 4

Given below are the half-cell reactions 

(JEE Main 2014)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 4



Since, the value of E° is -ve, therefore the reaction is non-spontaneous.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 5

Based on the data given above, strongest oxidising agent will be

(AIEEE 2013)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 5

Higher the SRP (Standard Reduction Potential), stronger is the oxidising agent. Among the given, electrode potentials,    is highest. Hence, is the strongest oxidising agent.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 6

The standard reduction potentials for Zn2+ / Zn, Ni2+ /Ni and Fe2+ / Fe are - 0.76, - 0.23 and - 0.44 V, respectively. The reaction X + y2+→ X2+ + Y will be spontaneous when

(AIEEE 2012)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 6

A cell reaction is spontaneous, if ΔG° < 0.





Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 7

The reduction potential of hydrogen half-cell will be negative if 

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 7

 For hydrogen electrode,

Here, n = number of electrons involved in the reaction



Hence, when p(H2) is 2 atm and [H+] is 1.0 M, Ered is negative.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 8

Resistance of 0.2 M solution of an electrolyte is 50 Ω The specific conductance of the solution is 1.3 Sm-1. If resistance of the 0.4 M solution of the same electrolyte is 260 Ω, its molar conductivity is

(AIEEE 2011)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 8




Molar conductivity of the solution is given by 

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 9

The Gibbs energy for the decomposition of Al2O3 at 500°C is as follows

The potential difference needed for electrolytic reduction of Al2O3 at 500°C is at least 

(AIEEE 2010)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 9


Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 10

The value of standard electrode potenital for the charge,

(AIEEE 2009)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 10

It is given that

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 11

The potential for the cell

Cr | Cr3+ (0.1 M) || Fe2+ (0.01 M) | Fe is

(AIEEE 2008)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 11



Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 12

The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25°C a re given below


What additional information /quantity one needs to calculateof an aqueous solution of acetic acid?

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 12

Molar conductivity of aqueous CH3COOH solution can be calculated from Kohlraush’s law as

Hence, for determining the molar conductivity of CH3COOH solution, is required.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 13

The cell, Zn | Zn2+ (1 M) || Cu2+ (1 M) | Cu

(E°cell = 1.10 V), was allowed to be completely discharged at 298 K. The relative concentration 

(AIEEE 2007)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 13

Cell is completely discharged. It means equilibrium gets established, Ecell = 0


Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 14

Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 Ω. The conductivity of this solution is 1.29 Sm-1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 Ω. The molar conductivity of 0.2 M solution of the electrolyte will be

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 14

For 0.1 M solution,


For 0.2 M solution
Given, ft = 520 Ω, C = 0.2 M,
μ (molar conductivity) = ?

k can be calculated as now cell constant is known]

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 15

The molar conductivities and at infinite dilution in water at 25°C are 91.0 and 426.2S cm2/mol, respectively. To calculate a additional value required is

(AIEEE 2006)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 15

According to Kohlrausch's law

Thus, on adding Eqs. (ii) and (ill),
subtracted, we can obtained the value of . Thus, additional value required is λ°NaCl.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 16

Given the data at 25°C,

What is the value of log Ksp for Agl?

(AIEEE 2006)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 16


Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 17

Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25°C

(AIEEE 2005)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 17

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 18

Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (atomic mass = 27 u; 1 Faraday = 96500 C). The cathode reaction is

To prepare 5.12 kg of aluminium metal by this method would require

(AIEEE 2005)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 18


where, w = amount of metal = 5.12 kg = 5.12 x 10g
z = electrochemical equivalent
 

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 19

The limiting molar conductivities for NaCI, KBr and KCI are 126, 152 and 150S cm2 mol-1, respectively . The for NaBr is

(AIEEE 2004)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 19

By Kohlrausch’s law.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 20

The E°m3+/m2+ values for Cr, Mn, Fe and Co are

- 0.41, + 1.57, + 0.77 and + 1.97 V,

respectively . For which one of these metals, the change in oxidation state from + 2 to + 3 is easiest?

(AIEEE 2004)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 20


More negative value of E°red indicates better reducing agent. Thus, easily oxidised. Hence, oxidation of Cr2+ to Cr3+ is the easiest.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 21

Consider the following Eo values :

Under standard conditions, the potential for the reaction,

(AIEEE 2004)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 21


Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 22

In a cell that utilises the reaction,
Zn (s)+ 2H + (aq) → Zn2+ (aq),+ H2(g)

addition of H2SO4 to cathode compartment will

(AIEEE 2004)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 22




If H2SO4 is added to cathodic compartment, (towards reactant side), then Q decrease (due to increase in H+).
Hence, equilibrium is displaced towards right and Ecell increases.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 23

The standard emf of a cell, involving one electron change is found to be 0.591 V at 25° C. The equilibrium constant of the reaction is (F= 96500 C mol-1)

(AIEEE2004)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 23

Relation between Keq and E°cell is 

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 24

When during electrolysis of a solution of AgNO3, 9650 C of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

(AIEEE 2003)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 24


Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 25

Standard reduction electrode potentials of three metals A, B and C are + 0.5 V, - 3.0 V and - 1.2 V, respectively. The reducing power of these metals are

(AIEEE 2003)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 25

More negative value of E° means higher reducing power.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 26

For a cell reaction involving a two electron change, the standard emf of the cell is found to be 0.295 V at 25°C. The equilibrium constant of the reaction at 25°C will be

(AIEEE 2003)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 26

The standard emf of the cell,

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 27

Conductivity (Seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then constant of proportionality is expressed in

(AIEEE 2002)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 27

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 28

(AIEEE 2002)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 28

At LHS (oxidation)


Note E° values remain constant when half-cell equation is multiplied/divided.

Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 29

For the following cell with hydrogen electrodes at two different pressures p1 and p2

emf is given by 

(AIEEE 2002)

Detailed Solution for Retro (Past 13 Year) JEE Main (Electrochemistry) - Question 29

LHS half-cell


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