NEET 2026 Electrochemistry & Redox Reactions Practice Test | Most Repeated Questions

NEET 2026 Electrochemistry & Redox Reactions – Most Repeated Questions

This NEET 2026 Chemistry practice test includes Electrochemistry and Redox Reactions. All questions are written word-to-word exact as per NEET exam level and NCERT. Highly useful for revision and fast score improvement.

The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows:
(2/3) Al₂O₃ → (4/3) Al + O₂
ΔᵣG = +960 kJ mol⁻¹

The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500°C is at least

4.5 V

3.0 V

2.5 V

5.0 V

From the following select the one which is not an example of corrosion.

Rusting of iron object

Production of hydrogen by electrolysis of water

Tarnishing of silver

Development of green coating on copper and bronze ornaments

Aqueous solution of which of the following compounds is the best conductor of electric current?

Hydrochloric acid, HCl

Ammonia, NH₃

Fructose, C₆H₁₂O₆

Acetic acid, C₂H₄O₂

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option.

540.48 S cm² mol⁻¹

201.28 S cm² mol⁻¹

390.71 S cm² mol⁻¹

698.2 S cm² mol⁻¹

For a cell involving one electron E°cell = 0.59 V at 298 K, the equilibrium constant for the cell reaction is:
[Given that 2.303RT/F = 0.059 V at T = 298 K]

1.0 × 10³⁰

1.0 × 10¹⁰

1.0 × 10²

1.0 × 10⁵

Number of moles of MnO₄⁻ required to oxidize one mole of ferrous oxalate completely in acidic medium will be

7.5 moles

0.2 moles

0.6 moles

0.4 moles

(I) H₂O₂ + O₃ → H₂O + 2O₂
(II) H₂O₂ + Ag₂O → 2Ag + H₂O + O₂

Role of Hydrogen peroxide in the above reactions is respectively

oxidizing in (I) and reducing in (II)

reducing in (I) and oxidizing in (II)

reducing in (I) and (II)

oxidizing in (I) and (II)

The oxidation states of sulphur in the anions SO₃²⁻, S₂O₄²⁻ and S₂O₆²⁻ follow the order

S₂O₄²⁻ < SO₃²⁻ < S₂O₆²⁻

SO₃²⁻ < S₂O₄²⁻ < S₂O₆²⁻

S₂O₄²⁻ < S₂O₆²⁻ < SO₃²⁻

S₂O₆²⁻ < S₂O₄²⁻ < SO₃²⁻

Which is the best description of the behaviour of bromine in the reaction given below?
H₂O + Br₂ → HOBr + HBr

Proton acceptor only

Both oxidised and reduced

Oxidised only

Reduced only

Standard reduction potentials of the half reactions are given below:
F₂ + 2e⁻ → 2F⁻ ; E° = +2.85 V
Cl₂ + 2e⁻ → 2Cl⁻ ; E° = +1.36 V
Br₂ + 2e⁻ → 2Br⁻ ; E° = +1.06 V
I₂ + 2e⁻ → 2I⁻ ; E° = +0.53 V

The strongest oxidising and reducing agents respectively are

F₂ and I⁻

Br₂ and Cl⁻

Cl₂ and Br⁻

I₂ and F⁻