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31 Year NEET Previous Year Questions: Electrochemistry - 2 - NEET MCQ


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30 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: Electrochemistry - 2

31 Year NEET Previous Year Questions: Electrochemistry - 2 for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: Electrochemistry - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Electrochemistry - 2 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Electrochemistry - 2 below.
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31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 1

On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 1

 At anode :

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 2

Which of the following is an insulator ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 2

Diamond is an insulator.

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31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 3

The standard reduction poten tials at 25°C of
Li+/ Li, Ba 2+ / Ba, Na+ / Na
and Mg 2+ / Mg are – 3.03, – 2.73, – 2.71 and – 2.37 volt respectively. Which one of the following is the strongest oxidising agent? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 3

Higher the reduction potential, stronger is the oxidizing agent.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 4

The most durable metal plating on iron to protect against corrosion is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 4

This is because zinc has higher oxidation potential than Ni, Cu and Sn. The process of coating of iron surface with zinc is known as galvanization. Galvanized iron sheets maintain their lustrue due to the formation of protective layer of basic zinc carbonate.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 5

On heating one end of a piece of a metal, the other end becomes hot because of [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 5

When one end of a metal is heated, t he free electrons are energised and move to the other end. It heats up the other end of the metal.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 6

If 0.5 amp current is passed through acidified silver nitrate solution for 100 minutes. The mass of silver deposited on cathode, is (eq.wt.of silver nitrate = 108) [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 6

Given current (i)  = 0.5 amp;
Time (t) = 100 minutes × 60 = 6000 sec
Equivalent weight of silver nitrate (E) = 108.
According to Faraday's first law of electrolysis

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 7

An electr och emical cell is set up as: Pt; H2 (1atm)|HCl(0.1 M) || CH3COOH (0.1 M)| H2 (1atm); Pt. The e.m.f of this cell will not be zero, because [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 7

For a concentration cell having different concentrations of ions.

If all the concentrations are identical then obviously the cell voltage is zero. But as the pH of 0.1 M HCl (strong acid) & pH of 0.1M CH3 COOH is (weak acid) not same, therefore the cell voltage is not zero.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 8

On passing a current of 1.0 ampere for 16 min and 5 sec through one litre solution of CuCl2, all copper of the solution was deposited at cathode. The strength of CuCl2 solution was (Molar mass of Cu= 63.5; Faraday constant = 96,500 Cmol–1) [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 8

By Faraday's Ist Law, 

(where q = it = charge of ion) we know that no of equivalent

(where i= 1 A, t = 16×60+5 = 965 sec.) Since, we know that

Normality 

= 0.01 N

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 9

Equivalent conductances of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91 ohm–1 cm2 respectively. The equivalent conductance of CH3COOH at infinite dilution would be [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 9

By Kohlraush's law, 

on adding (2) and (3) then subtract (1) from it

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 10

If 0.01 M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm–1, then its molar conductance in ohm–1 cm2 mol–1 is [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 10

Given molarity = 0.01 M Resistance = 40 ohm;

Cell constant

Specific conductivity (k)

Molar conductance  

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 11

Eº for the cell, 

1.10 V at 25ºC. The equilibrium constant for the cell reaction:

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 11

Given for the reaction

  At equilibrium

here (n →  number of exchange of electrons)

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 12

 Standard potentials (Eº) for some half-reactions are given below :



 Eº = +1.45 V

Based on the above, which one of the following statements is correct ? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 12

In elctrochemical series, Sn is above hydrogen and Hg below hydrogen. Elements above hyrogen are reducing in nature while below hydrogen are oxidising in nature.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 13

For the cell reaction, [1998] Cu2+ (C1, aq) + Zn(s) = Zn2+ (C2, aq) + Cu(s) of an electrochemical cell, the change in free energy, ΔG, at a given temperature is a function of

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 13

For concentration cell,

In it R, T, n and F are constant So E is based upon ln C2 / C1

Now 

= –RTlnC2/C1

At constant temperature ΔG is based upon ln C2/C1.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 14

Without losing its concentration ZnCl2 solution cannot be kept in contact with [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 14

With out losing its concentrati on Zn Cl2 solution can not kept in contact with Al because Al is more reactive than Zn due to electrode (reduction) potential.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 15

What is the Eºcell for the reaction

at 25ºC if the equilibrium constant for the reaction is  1 × 106? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 15

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 16

Th e ionic conductan ce of Ba2+ an d Cl are respectively 127 and 76 ohm–1 cm2 at infinite dilution. The equivalent conductance (in ohm–1 cm2) of BaCl2 at infinite dilution will be : [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 16

The equivalent con ductance of BaCl2 at infinite dilution

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 17

Cu +aq is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction : [2000]

choose correct Eº for above reaction if Eº Cu2+/Cu = 0.34 V and Eº Cu2+/Cu+ = 0.15 V

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 17

Again,  

  = 0.53 – 0.15 = 0.38 V.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 18

 Specific conductance of a 0.1 N KCl solution at 23ºC is 0.012 ohm–1 cm–1. Resistance of cell containing the solution at same temperature was found to be 55 ohm. The cell constant is [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 18

Given specific conductance of the solution (k) = 0.012 ohm–1 cm–1 and resistance (R) = 55 ohm. We know that cell constant = Specific conductance × Observed resistance = 0.012 × 55= 0.66cm–1.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 19

Standard electrode potentials are : Fe+2/Fe [ Eº = –0.44]; Fe+3/Fe+2  Eº = + 0.77 ; If Fe+2, Fe+3 and Fe blocks are kept together, then [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 19

The metals having higher negative electrode potential can displaced metals having lower values of negative electrode potential from their salt solutions.

Hence B is correct.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 20

The most convenient method to protect the bottom of ship made of iron is [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 20

For bottom of ship to be protected it is connected with more reactive metal than iron like magnesium. This technique is called cathodic protection.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 21

In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3. The reason is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 21

In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3. Copper being more electropositive readily precipitate silver from their salt solution

whereas in K[Ag (CN)2] solution a complex anion [Ag(CN)2] is formed and hence Ag+ are less available in the solution and therefore copper cannot displace Ag from its  complex ion.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 22

Which reaction is not feasible? [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 22

reaction is not possible because Br ion is not oxidised in Br2 with I2 due to higher electrode (oxidation) potential of I2 than bromine.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 23

In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam. This is because [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 23

In electrolysis of NaCl when Pt electrode is taken then H2 liberated at cathode while with Hg cathode it forms sodium amalgam because more voltage is required to reduce H+ at Hg than Pt.z

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 24

The e.m.f. of a Daniell cell at 298 K is E1.

When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2.What is the relationship between E1 and E2? [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 24

Cell reaction is, 

Greater the factor less is the EMF

Hence E1 > E2

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 25

On the basis of the information available from the reaction

the minimum e.m.f required to carry out an electrolysis of Al2O3 is (F = 96500 C mol–1)

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 25

ΔG = –nEF

For 1 mol of Al, n = 3

According to question, 827 x1000 = 4 x E x 96500

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 26

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be    (Given F = 96500 C mol–1; R = 8.314JK– 1mol–1)[2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 26

Here, n = 2, E° = 0.295

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 27

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 27

No. of gram equivalent of H+ = No. of gm eq. of

No. of gm eq. of H+ = no. of mole of H+ Hence Mass of H+ = 0.5 × 1g = 0.5 g

We know that, 2g H2 at STP = 22.4 L

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 28

If , the standard EMF of the reaction Fe + 2Fe3+ → 3Fe2+  will be [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 28

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 29

A hypoth etical electrochemical cell is shown below [2006] The emf measured is +0.20 V. The cell reaction is  

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 29

The cell reacton is as follows :

(c) is correct answer.

31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 30

The efficiency of a fuel cell is given by [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Electrochemistry - 2 - Question 30

Efficiency of a fuel cell 

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