In the conversion, H2SO4 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 could be reduced by the resulting solution if it is further oxidized to VO2+ ions?
[Assume no change in state of Zn2+ions] (V = 51, O =16, I = 127) :
1. | 0.11 mole of I2 | 2. | 0.22 mole of I2 |
3. | 0.055 mole of I2 | 4. | 0.44 mole of I2 |
The oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively -
1. | +3, +5, +4 | 2. | +5, +3, +4 |
3. | +5, +4, +3 | 4. | +3, +4, +5 |
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 Br2 + CrO42- + 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?
1. | NO3-, SO3, Na | 2. | Fe+3, NO3-, SO3 |
3. | I-, Na | 4. | I-, NO3- |
The compound having oxygen in - 1 oxidation state is:-
1. | H2O | 2. | O2F2 |
3. | Na2O | 4. | BaO2 |
Which of the following is not an intramolecular redox reaction?
1. NH4NO2 N2 + 2H2O
2. 2Mn2O7 4MnO2 + 3O2
3. 2KClO3 2KCl + 3O2
4. 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