JEE 2021 | Redox reaction

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Question 1

The oxidation state of each oxygen atom in is

• A– 2 each
• B– 2 and zero
• C– 1 each
• DNone of the above

Question 2

An example of a disproportionation reaction is :

• A2 MnO^-₄ + 10 I^- + 16 H⁺→ 2 Mn²⁺ + 5 I₂ + 8 H₂O
• B2 NaBr + Cl₂→ 2 NaCl + Br₂
• C2 CuBr→ CuBr₂ +Cu
• D2 KMnO₄→ K₂MnO₄ + MnO₂ + O₂

Question 3

In order to oxidise a mixture of one mole of each of FeC₂O₄,Fe(C₂O₄)₃,FeSO₄ and Fe₂(SO₄)₃ in acidic medium, the number of moles of KMnO₄ required is:

• A2
• B1.5
• C1
• D3

Question 4

The 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?

• ACr
• BMn
• CFe 2²
• DCo

Question 5

Hypo is used in photography due to its

• Areaction with light
• Breducing property
• Coxidising property
• Dcomplex forming nature

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