Redox reactions - Quiz

Balance the following ACIDIC reactions using the half-reaction method.

MnO₄⁻ + H⁺ + C₂O₄^2- → Mn²⁺ + CO₂

Water is a product of this reaction. What is the coefficient of water in the final balanced equation?

• 8

• 5

• 2

• 16

What element is being Oxidized?

• I
• H
• S
• O

Which of the following will not show disproportionation reaction :

• ClO^-

• ClO₂^-

• ClO₃^-

• ClO₄^-

Product of electrolysis : An aqueous solution of silver nitrate with platinum electrodes

• Anode : Ag

  Cathode : NO₃

• Anode : NO₃

  Cathode : Ag

• Anode : O₂

  Cathode : Ag

• none of these

Balance the following reactions using the half-reaction method.

MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s)

How many electrons did you cross out on both side?

• 1 e^-

• 2 e^-

• 5 e^-

• 10 e^-

In the standardisation of Na₂S₂O₃ using K₂Cr₂O₇ by iodometry, the equivalent weight of K₂Cr₂O₇ is :

• molecular weight / 2

• molecular weight / 6

• molecular weight / 3

• same molecular weight

Assertion : Sulphur dioxide and chlorine are oth bleaching agents.

Reason : Both are reducing agents.

• Both assertion and reason are true and the reason is the correct explanation of asserton.

• Both assertion and reason are true but the reason is not the correct explanation of asserton.

• Assertion is true and the reason is false

• Both assertion and reason are false.

Assertion : Fe reacts with HCl to produce H₂.

Reason : Fe is better reducing agent than H₂.

• Both assertion and reason are true and the reason is the correct explanation of asserton.

• Both assertion and reason are true but the reason is not the correct explanation of asserton.

• Both assertion and reason are false

• Assertion is true and reason is false.

In the balanced chemical reaction,

IO₃^- + a I^- + b H⁺ ------> c H₂O + d I_{2 ,}

a,b,c and d are :

• 5,6,3,3

• 5,3,6,3

• 5,5,3,6

• 5,6,5,5

KMnO₄ is strong oxidising agent in acid medium. To provide acid medium, H₂SO₄ is used instead of HCl because :

• H₂SO₄ is stronger acid than HCl

• HCl is oxidised to Cl₂ by KMnO4

• H₂SO₄ is dibasic acid

• rate is faster in the presence of H₂SO₄