A dilute solution of H2 SO4 was electrolysed by passing a current of 2 amp. The time required for formation of 0.5 mole of oxygen is

(1) 26.8 hours                                    

(2) 13.4 hours

(3) 6.7 hours                                      

(4) 28.6 hours

Subtopic:  Faraday’s Law of Electrolysis |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The standard reduction potentials for Mn3+/Mn2+ and MnO2 /Mn3+ couples in acid medium at 25°C are 1.50 V and 1.00 V respectively. The following reaction:

2Mn3+ + 2H2O  Mn2+ + MnO2 + 4H+ is

(1) reversible                                             

(2) non-spontaneous

(3) spontaneous                                         

(4) irreversible

Subtopic:  Electrode & Electrode Potential |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In the following electrochemical cell, M|M+ || X-|X, the standard reduction potentials are E°M+/M= 0.52 V and E°X/X- = 0.42 V at 25°C. Which one of the following statements is correct ?

(1) M + X  M+ + X- is spontaneous              

(2) M+ + X- M + X is spontaneous

(3) Ecell = 0.77 V                                              

(4) Ecell=  0.77 V

Subtopic:  Electrode & Electrode Potential |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

1If a 100 mL solution of 0.1M HBr is titrated using a very concentrated solution of NaOH, when the conductivity (specific conductance) of the solution at the equivalence point will 3e (assume volume change is negligible due to addition of NaOH). Calculate your answer in terms of 10-1Sm-1,

Given °Na+=8×10-3Sm2mol-1 °Br-=4×10-3S m2 mol-1

(1) 6                               

(2) 12

(3) 15                             

(4) 24

Subtopic:  Conductance & Conductivity |
 75%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The volume of gases liberated at STP when a charge of 2F is passed through aqueous solution of sodium phosphate, is :

1. 11.2L                                           

2. 44.8L

3. 33.6L                                           

4. 22.4L

Subtopic:  Faraday’s Law of Electrolysis |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

It is desired to convert the energy derived from the combustion of propane into electrical energy, via a fuel cell. Given that the standard free energies of formation of C3H8 (g), H2O(l) and CO2 (g) are -23.5, -237.2 and -394.4 kJ mol-1 respectively, calculate the standard EMF of the propane fuel cell.

(1) 1.10 V                                           

(2) 2.10V

(3) 3.12 V                                           

(4) 4.12 V

Subtopic:  Relation between Emf, G, Kc & pH |
 52%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The temperature coefficient of a standard Cd-cell is 5.0 × 10-5 Vk-1 whose emf at 25°C is 1.018 V. During the cell operation, the temperature will -

(1) increase                                      

(2) decreases

(3) either                                         

(4) remains constant

Subtopic:  Relation between Emf, G, Kc & pH |
 63%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Na-amalgam is prepared by electrolysis of NaCl solution using liquid Hg as a cathode. How

long should the current of 10 amp. is passed to produce 10% Na – Hg on a cathode of 10

gm Hg. (atomic mass of Na = 23).

(A) 7.77 min.                                               

(B) 9.44 min.

(C) 5.24 min.                                               

(D) 11.39 min.

Subtopic:  Faraday’s Law of Electrolysis |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can dissolve in 106 L of a 0.1 M AgNO3 solution is 

(1) 0.5 mmol                                              

(2) 1.0 mmol

(2) 2.0 mmol                                             

(4) 2.5 mmol

Subtopic:  Relation between Emf, G, Kc & pH |
 65%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The k= 4.95 × 10-5S cm-1 for a 0.00099 M solution. The reciprocal of the degree of dissociation of acetic acid, if m0 for acetic acid is 400 S cm2mol-1 will be:

1. 7 2. 8
3. 9 4. 10
Subtopic:  Conductance & Conductivity |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh