In the conversion, H₂SO₄ $\to \hspace{0.17em}$H₂S₂O₈ which process occurs?

1. Oxidation

2. Reduction

3. Oxidation as well as reduction

4. Neither oxidation nor reduction

If 10 gm of V₂O₅ is dissolved in acid and is reduced to V²⁺ by zinc metal, how many moles of I₂ can be reduced by the resulting solution if it is further oxidized to VO²⁺ ions?
[Assume no change in state of Zn²⁺ ions]
(Also, given atomic weight values: V = 51, O =16, I = 127) 

The oxidation states of P in H₄P₂O₅, H₄P₂O₆, H₄P₂O₇, are respectively -

The number of moles of MnO^-₄ required to oxidise one mole of ferrous oxalate completely in an acidic medium is-

1. 0.6 mole

2. 0.4 mole

3. 7.5 moles

4. 0.2 mole

In the reaction:

Al + Fe₃O₄  → Al₂O₃ + Fe

How many electrons are transferred in total during the reaction?

1. 6

2. 8

3. 8/3

4. 24

In the given reaction,

xBrO₃^-+ yCr⁺³ + zH₂O $\to$Br₂ + CrO₄^2- + H⁺

The coefficients x, y, and z are respectively-

1. 6, 10, 11

2. 6, 10, 20

3. 6, 8, 22

4. 6, 10, 22

Which is the correct set that can only act as an oxidant? 

 The compound having oxygen in - 1 oxidation state is:-

Which of the following is not an intramolecular redox reaction?

1. NH₄NO₂ $\to$N₂ + 2H₂O

2. 2Mn₂O₇ $\to$4MnO₂ + 3O₂

3. 2KClO₃ $\to$2KCl + 3O₂

4. $2{\mathrm{H}}_2{\mathrm{O}}_2$ $\to$2H₂O + O₂

Sn⁺⁺ loses two electrons in a reaction. The final oxidation number of tin will be:

1. + 2

2. Zero

3. + 4

4. – 2