11th Class Chemistry Redox Reactions Question Bank 11th CBSE Chemistry Redox Reactions

  • question_answer Determine the oxidation number of the element in the bold in the following species (i)\[Si{{H}_{4}}\]                (ii)\[B{{H}_{3}}\]                               (iii)\[B{{F}_{3}}\]                (iv)\[{{S}_{2}}O{{_{3}^{{}}}^{2-}}\]           (v)\[BrO{{_{4}^{{}}}^{-}}\]     (vi)\[HP{{O}_{4}}^{2-}\]               

    Answer:

    (i) \[Si{{H}_{4}}\] : \[\overset{x}{\mathop{S}}\,i{{\overset{+1}{\mathop{H}}\,}_{4}}\] \[x+4(+1)=0\] or\[x=-4\]
    (ii) \[B{{H}_{3}}\] \[:\overset{x}{\mathop{B}}\,{{\overset{+1}{\mathop{H}}\,}_{3}}\] \[x+3(+1)=0\] or \[x=-3\]
    (iii) \[B{{F}_{3}}\] :\[\overset{x}{\mathop{B}}\,{{\overset{-1}{\mathop{F}}\,}_{3}}\] \[x+3(-1)=0\] or \[x=+3\]
    (iv) \[{{S}_{2}}{{O}_{3}}^{2-}\] \[:{{\overset{x}{\mathop{S}}\,}_{2}}{{\overset{-2}{\mathop{O}}\,}_{3}}\] \[2(x)+3(-2)=-2\] or \[x=+2\]
    (v) \[BrO{{_{4}^{{}}}^{-}}\] \[:\overset{x}{\mathop{B}}\,r\,{{\overset{-2}{\mathop{O}}\,}_{4}}\] \[x+4(-2)=-1\] or \[x=+7\]
    (vi) \[HP{{O}_{4}}^{2-}\] : \[\overset{+1}{\mathop{H}}\,\overset{x}{\mathop{P}}\,\,{{\overset{-2}{\mathop{O}}\,}_{4}}\] \[(+1)+x+4(-2)=-2\] or \[x=+5\]


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