Q16 / 160 · TS EAMCET 2018 (05 May Shift 2) · Chemistry

When borax is dissolved in water, the product formed is

  • Correct answer
    A
    $\mathrm{H}_3 \mathrm{BO}_3$
  • B
    $\mathrm{H}_2 \mathrm{BO}_3$
  • C
    $\mathrm{B}_2 \mathrm{H}_6$
  • D
    $\mathrm{B}_2 \mathrm{O}_3$

Solution

Borax is $\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7$. $$ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7+7 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{NaOH}+4 \mathrm{H}_3 \mathrm{BO}_3 $$ Borax produce sodium borate and boric acid on the hydrolysis.

Hence, the correct answer is option: 'A'.

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