Which of the following equations is not correctly formulated?

Which of the following equations is not correctly formulated?
  1. \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}ight] \cdot 8 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{HCl} ightarrow 2 \mathrm{NaCl}+4 \mathrm{H}_{3} \mathrm{BO}_{3}+5 \mathrm{H}_{2} \mathrm{O}\)
  2. \(2 \mathrm{BN}+6 \mathrm{H}_{2} \mathrm{O} ightarrow 2 \mathrm{H}_{3} \mathrm{BO}_{3}+2 \mathrm{NH}_{3}\)
  3. \(\underset{\text{metaboric acid}}{\mathrm{H}_{3} \mathrm{BO}_{3} \xrightarrow[-\mathrm{H}_{2} \mathrm{O}]{375 \mathrm{~K}}\mathrm{HBO}_{2}}\); \(\underset{\text{tetraboric acid}}{4 \mathrm{HBO}_{2} \xrightarrow[-\mathrm{H}_{2} \mathrm{O}]{435 \mathrm{~K}} \mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}}\); \(\underset{\text{Boric oxide}}{\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \xrightarrow[-\mathrm{H}_{2} \mathrm{O}]{\text{red heat}} 2\mathrm{~B}_{2} \mathrm{O}_{3}}\)
  4. \(\mathrm{H}_{3} \mathrm{BO}_{3}\) is a weak monobasic acid as it liberates hydrogen ions as \(\mathrm{H}_{3} \mathrm{BO}_{3} ightarrow \mathrm{H}^{+}+\mathrm{H}_{2} \mathrm{BO}_{3}^{-}\)

Solution

\(\mathrm{H}_{3} \mathrm{BO}_{3}\) is a weak monobasic acid. It does not liberate \(\mathrm{H}^{+}\)but accepts \(\mathrm{OH}^{-}\), i.e. it is Lewis acid. ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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