\(2(+1)+2 x+7(-2)=0\)
\(x=+6\)
In \(K _{2} Cr _{2} O _{7},\) Transition metal \(( Cr )\) present in +6
oxidation state.
\(KMnO _{4}\)
\((+1)+y+4(-2)=0\)
\(x=+7\)
In \(KMnO _{4}\), transition metal (Mn) present in \(+7\) oxidation state
\(K _{2} FeO _{4}\)
\(2(+1)+z+4(-2)=0\)
\(x=+6\)
In \(K _{2} FeO _{4},\) transition metal (Fe) present in \(+6\) oxidation state
So \(x=+6\)
\(y=+7\)
\(z=+6\)
____________
\(x+y+z=19\)
(નોંધ : ધ્યાનમાં લો કે યોગ્ય સૂચકનો ઉપયોગ થયો છે)
${H_2}\mathop S\limits^{ } {O_4}\,\,\,\,\, \to \,\,\,\,\,\mathop S\limits^{ } {O_2}$
${N_2}{O_3}\xrightarrow{{R.T.}}NO + N{O_2}$
$xMn{O_4}^ - \, + \,y{H_2}S{O_4}\, \to \,2M{n^{2 + }}\, + \,5{H_2}O\, + \,z{e^ - }$
$S _{8( s )}+ a OH ^{-}_{( aq )} \rightarrow b S ^{2-}_{( aq )}+ c S _{2} O _{3}{ }^{2-}{ }_{( aq )}+ d H _{2} O _{(\ell)}$
$'a'$ નું મૂલ્ય ............ છે. (પૂર્ણાક જવાબ)