Oxidation Number Method
Trending Questions
Q.
xH2SO4+ySO2+zNa2CrO4⟶Cr2(SO4)3+aNa2SO4+bH2O
In the above reaction, x, y, z, a and b are?
2, 3, 2, 2, 2
2, 2, 2, 2, 2
4, 3, 2, 1, 0
0, 1, 2, 3, 4
Q.
How many H2O should be added to the RHS of the following equation to balance number of oxygen atoms on the left ?
6Fe2++Cr2O2−7+14H+⟶6Fe3++2Cr3++ ___________
2
5
7
4
Q. For the following balanced equation :
aFe2++bCr2O2−7+cH+⟶dFe3++eCr3++ fH2O
The value of a+b+c+d+e+f is :
aFe2++bCr2O2−7+cH+⟶dFe3++eCr3++ fH2O
The value of a+b+c+d+e+f is :
- 36
Q. For the balanced chemical equation :
xH2SO4+ySO2+zNa2CrO4⟶Cr2(SO4)3+aNa2SO4+bH2O
The value of x+y+z-a-b is :
xH2SO4+ySO2+zNa2CrO4⟶Cr2(SO4)3+aNa2SO4+bH2O
The value of x+y+z-a-b is :
- 3
Q. A 4 mol mixture of Mohr’s salt and Fe2(SO4)3 requires 400 ml of 0.5 M KMnO4 for complete oxidation in an acidic medium. The percentage of Mohr’s salt in the mixture is:
- 40 %
- 5 %
- 50 %
- 25 %
Q. The number of moles of KMnO4 that will be needed to react completely with one mole of ferrous oxalate in an acidic solution is:
- 15
- 35
- 25
- 45
Q. Find the equivalent weight of K2Cr2O2−7 in the given reaction, if the molar mass of Cr2O2−7 is 'M' ?
K2Cr2O2−7H+→Cr3+
K2Cr2O2−7H+→Cr3+
- M6
- M3
- M
- 2M
Q. What are the stoichiometric coefficients in the balanced redox reaction only for the species in the unbalanced reaction respectively.This reaction is used by the Breathalyzer to detect ethyl alcohol in a driver's breath?
C2H5OH+Cr2O2−7→CH3COOH+Cr3+
C2H5OH+Cr2O2−7→CH3COOH+Cr3+
- Reactants: 2, 2; products: 2, 4
- Reactants: 3, 1; products: 3, 2
- Reactants: 3, 2; products: 3, 4
- Reactants: 3, 4; products: 3, 8
Q. What would be the coefficient of H+ and H2O respectively in the balanced net ionic equations for the given redox reactions in acidic solution:
S4O2−6(aq)+Al(s)→H2S(aq)+Al3+(aq)
S4O2−6(aq)+Al(s)→H2S(aq)+Al3+(aq)
- 20, 6
- 6, 20
- 10, 4
- 4, 10
Q. The reaction of the permanganate ion with the oxalate ion in acidic solution forms manganese(II) ion and carbon dioxide. What is the stoichiometric coefficient in front of manganese(II) in the balanced redox equation?
MnO−4+C2O2−4→Mn2++CO2
MnO−4+C2O2−4→Mn2++CO2
- 2
- 1
- 3
- 5