In which of the following compounds, the oxidation number of iodine is fractional ?
-
Solution
O.N. of iodine in \(I_{3}^{-}\) is –1/3.
In the reaction
Ag2O + H2O2 ⟶ 2Ag + H2O + O2, the H2O2 acts as :
-
Solution
H2O2 is converting Ag2O into Ag,so it is reducing Ag2O. Hence it is a reducing agent here.
In which of the following transition metal complexes does the metal exhibit zero oxidation state ?
-
Solution
In metal carbonyls metal always has O.N. zero.
When SO2 is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in valency of chromium is
-
Solution
In which of the following compounds the oxidation number of carbon is not zero?
-
Solution
O.N. of carbon in CH3CHO is –1; in other cases it is zero.
The values of standard oxidation potentials of following reactions are given below :
(i)Zn ⟶ Zn2+ + 2e–; Eº = 0.762V
(i)Fe ⟶ Fe2+ + 2e–; Eº = 0.440V
(i)Cu ⟶ Cu2+ + 2e–; Eº = -0.345V
(i)Ag ⟶ Ag+ + e–; Eº = -0.800V
Which of the following is most easily reduced
-
Solution
As the oxidation potential of Ag is the lowest among the given elements, hence it would be reduced most readily.
Among the following, identify the species with an atom in+6 oxidation state
-
Solution
\(MnO_{4}^{-}\) (O.S. of Mn +7); \(Cr(CN)_{6}^{3-}\)(O.S. of Cr+3), \(NiF_{6}^{2-}\)(O.S. of Ni +4) and CrO2Cl2 (O.S. of Cr +6).
On reduction of KMnO4 by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change?
-
Solution
In acidic medium \(MnO_{4}^{-}\) changes to Mn2+, hence O.N.changes from +7 to +2.
In which of the compounds does ‘manganese’ exhibit highest oxidation number ?
-
Solution
O.N. of Mn in K2MnO4 is +6
H2C2O4 + KMnO4 in acidic medium reacts to have change in oxidation number of Mn from :
-
Solution
\(MnO_{4}^{-}\) changes to Mn2+
\(MnO_{4}^{-}\) + 8H+ + 5e = Mn2+ + 4H2O
Oxidation No of Mn charges from +7 to + 2