Explanation:

Explanation:

In \(\mathrm{\mathrm{FeS}_{2}}\), persulphide is linkage is present rather than sulphide. So, oxidation state of \(\mathrm{\mathrm{S}}\) is 1 i.e., \(\mathrm{\mathrm{S}_{2}{ }^{2-}}\).
The O.N. of \(\mathrm{\mathrm{Fe}}\) in \(\mathrm{\mathrm{FeS}_{2}}\) is +2 .

Explanation:

Let the oxidation number of \(\mathrm{\mathrm{Cr}}\) in \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) be \(\mathrm{\mathrm{x}}\)
Oxidation number of \(\mathrm{\mathrm{O}=-2, \mathrm{~K}=+1}\)\(\mathrm{(2 \times 1)+2 x+(7-2)=0}\)
\(\mathrm{2+2 x+14=0}\)
\(\mathrm{2 \mathrm{x}=12}\)
\(\mathrm{\mathrm{x}=+6}\)

Explanation:

\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,{\rm{N}}\,\,{\rm{in}}\,\,{\rm{N}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}{{\rm{O}}_{\rm{4}}}\,\,{\rm{is + 4}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\).
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{P}}\,\,{\rm{in}}\,\,{{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\,\,{\rm{and}}\,\,{{\rm{P}}_{\rm{4}}}{{\rm{O}}_{{\rm{10}}}}\,\,{\rm{is + 5}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,\,{\rm{N}}\,\,{\rm{in}}\,\,{{\rm{N}}_{\rm{2}}}{\rm{O}}\,\,{\rm{is + 1}}\,{\rm{and}}\,{\rm{in}}\,\,{\rm{NO,it}}\,{\rm{is + 2,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{1}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{S}}\,\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{is + 4}}\,\,{\rm{and}}\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{3}}}{\rm{,it}}\,{\rm{is + 6,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is + 2}}\).

Explanation:

Explanation:

In \(\mathrm{\mathrm{FeS}_{2}}\), persulphide is linkage is present rather than sulphide. So, oxidation state of \(\mathrm{\mathrm{S}}\) is 1 i.e., \(\mathrm{\mathrm{S}_{2}{ }^{2-}}\).
The O.N. of \(\mathrm{\mathrm{Fe}}\) in \(\mathrm{\mathrm{FeS}_{2}}\) is +2 .

Explanation:

Let the oxidation number of \(\mathrm{\mathrm{Cr}}\) in \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) be \(\mathrm{\mathrm{x}}\)
Oxidation number of \(\mathrm{\mathrm{O}=-2, \mathrm{~K}=+1}\)\(\mathrm{(2 \times 1)+2 x+(7-2)=0}\)
\(\mathrm{2+2 x+14=0}\)
\(\mathrm{2 \mathrm{x}=12}\)
\(\mathrm{\mathrm{x}=+6}\)

Explanation:

\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,{\rm{N}}\,\,{\rm{in}}\,\,{\rm{N}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}{{\rm{O}}_{\rm{4}}}\,\,{\rm{is + 4}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\).
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{P}}\,\,{\rm{in}}\,\,{{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\,\,{\rm{and}}\,\,{{\rm{P}}_{\rm{4}}}{{\rm{O}}_{{\rm{10}}}}\,\,{\rm{is + 5}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,\,{\rm{N}}\,\,{\rm{in}}\,\,{{\rm{N}}_{\rm{2}}}{\rm{O}}\,\,{\rm{is + 1}}\,{\rm{and}}\,{\rm{in}}\,\,{\rm{NO,it}}\,{\rm{is + 2,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{1}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{S}}\,\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{is + 4}}\,\,{\rm{and}}\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{3}}}{\rm{,it}}\,{\rm{is + 6,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is + 2}}\).

Explanation:

Explanation:

In \(\mathrm{\mathrm{FeS}_{2}}\), persulphide is linkage is present rather than sulphide. So, oxidation state of \(\mathrm{\mathrm{S}}\) is 1 i.e., \(\mathrm{\mathrm{S}_{2}{ }^{2-}}\).
The O.N. of \(\mathrm{\mathrm{Fe}}\) in \(\mathrm{\mathrm{FeS}_{2}}\) is +2 .

Explanation:

Let the oxidation number of \(\mathrm{\mathrm{Cr}}\) in \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) be \(\mathrm{\mathrm{x}}\)
Oxidation number of \(\mathrm{\mathrm{O}=-2, \mathrm{~K}=+1}\)\(\mathrm{(2 \times 1)+2 x+(7-2)=0}\)
\(\mathrm{2+2 x+14=0}\)
\(\mathrm{2 \mathrm{x}=12}\)
\(\mathrm{\mathrm{x}=+6}\)

Explanation:

\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,{\rm{N}}\,\,{\rm{in}}\,\,{\rm{N}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}{{\rm{O}}_{\rm{4}}}\,\,{\rm{is + 4}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\).
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{P}}\,\,{\rm{in}}\,\,{{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\,\,{\rm{and}}\,\,{{\rm{P}}_{\rm{4}}}{{\rm{O}}_{{\rm{10}}}}\,\,{\rm{is + 5}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,\,{\rm{N}}\,\,{\rm{in}}\,\,{{\rm{N}}_{\rm{2}}}{\rm{O}}\,\,{\rm{is + 1}}\,{\rm{and}}\,{\rm{in}}\,\,{\rm{NO,it}}\,{\rm{is + 2,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{1}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{S}}\,\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{is + 4}}\,\,{\rm{and}}\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{3}}}{\rm{,it}}\,{\rm{is + 6,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is + 2}}\).

Explanation:

Explanation:

In \(\mathrm{\mathrm{FeS}_{2}}\), persulphide is linkage is present rather than sulphide. So, oxidation state of \(\mathrm{\mathrm{S}}\) is 1 i.e., \(\mathrm{\mathrm{S}_{2}{ }^{2-}}\).
The O.N. of \(\mathrm{\mathrm{Fe}}\) in \(\mathrm{\mathrm{FeS}_{2}}\) is +2 .

Explanation:

Let the oxidation number of \(\mathrm{\mathrm{Cr}}\) in \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) be \(\mathrm{\mathrm{x}}\)
Oxidation number of \(\mathrm{\mathrm{O}=-2, \mathrm{~K}=+1}\)\(\mathrm{(2 \times 1)+2 x+(7-2)=0}\)
\(\mathrm{2+2 x+14=0}\)
\(\mathrm{2 \mathrm{x}=12}\)
\(\mathrm{\mathrm{x}=+6}\)

Explanation:

\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,{\rm{N}}\,\,{\rm{in}}\,\,{\rm{N}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}{{\rm{O}}_{\rm{4}}}\,\,{\rm{is + 4}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\).
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{P}}\,\,{\rm{in}}\,\,{{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\,\,{\rm{and}}\,\,{{\rm{P}}_{\rm{4}}}{{\rm{O}}_{{\rm{10}}}}\,\,{\rm{is + 5}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{zero}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,\,{\rm{of}}\,\,{\rm{N}}\,\,{\rm{in}}\,\,{{\rm{N}}_{\rm{2}}}{\rm{O}}\,\,{\rm{is + 1}}\,{\rm{and}}\,{\rm{in}}\,\,{\rm{NO,it}}\,{\rm{is + 2,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is}}\,\,{\rm{1}}\)
\({\rm{O}}{\rm{.N}}{\rm{.}}\,{\rm{of}}\,\,{\rm{S}}\,\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{is + 4}}\,\,{\rm{and}}\,{\rm{in}}\,\,{\rm{S}}{{\rm{O}}_{\rm{3}}}{\rm{,it}}\,{\rm{is + 6,}}\)
\(\therefore \,\,{\rm{difference}}\,\,{\rm{is + 2}}\).