11th Class Chemistry The p-Block Elements-I

  • question_answer 80)   Identify the compounds 'A', 'X? and 'Z? in the following reactions. (i)\[A+2HCl+5{{H}_{2}}O\to 2NaCl+X\] (ii) \[X\xrightarrow[370K]{\Delta }HB{{O}_{2}}\xrightarrow[>370K]{\Delta }z\]

    Answer:

      \[A=Borax(N{{a}_{2}}{{B}_{4}}{{O}_{7}})\] \[X={{H}_{3}}B{{O}_{3}}\] \[Z={{B}_{2}}{{O}_{3}}\] \[\underset{\begin{smallmatrix}  (A) \\  Borax \end{smallmatrix}}{\mathop{N{{a}_{2}}{{B}_{4}}{{O}_{7}}}}\,+2HCl+5{{H}_{2}}O\xrightarrow{{}}2NaCl+\underset{\begin{smallmatrix}  (X) \\  Boric\,acid \end{smallmatrix}}{\mathop{4{{H}_{3}}B{{O}_{3}}}}\,\] \[2{{H}_{3}}B{{O}_{3}}\xrightarrow[\begin{smallmatrix}  370K \\  (-2{{H}_{2}}O) \end{smallmatrix}]{\Delta }2HB{{O}_{2}}\xrightarrow[\begin{smallmatrix}  >370K \\  (-{{H}_{2}}O) \end{smallmatrix}]{\Delta }\underset{\begin{smallmatrix}  (Z) \\  Boric  \\  anlydrode \end{smallmatrix}}{\mathop{{{B}_{2}}{{O}_{3}}}}\,\]


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