Q17 / 160 · TS EAMCET 2018 (05 May Shift 2) · Chemistry

$\mathrm{SiO}_2$ reacts with

  • A
    $\mathrm{H}_2 \mathrm{SO}_4, \mathrm{HF}$
  • Correct answer
    B
    $\mathrm{HF}, \mathrm{NaOH}$
  • C
    $\mathrm{Na}_2 \mathrm{CO}_3, \mathrm{NaOH}$
  • D
    $\mathrm{Na}_2 \mathrm{CO}_{31} \mathrm{H}_2 \mathrm{SO}_4$

Solution

$$ \begin{aligned} & \mathrm{SiO}_2+6 \mathrm{HF} \longrightarrow \mathrm{H}_2\left[\mathrm{SiF}_6\right]+2 \mathrm{H}_2 \mathrm{O} \\ & \mathrm{SiO}_2+2 \mathrm{NaOH} \longrightarrow \mathrm{Na}_2 \mathrm{SiO}_3+\mathrm{H}_2 \mathrm{O} \end{aligned} $$

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

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