Q33 / 170 · Manipal (MET) 2019 · Chemistry

$\mathrm{SiF}_4$ gets hydrolysed giving

  • A
    $\mathrm{SiO}_2$
  • B
    $\mathrm{Si}(\mathrm{OH})_2 \mathrm{~F}_2$
  • C
    $\mathrm{H}_2 \mathrm{SiF}_6$
  • Correct answer
    D
    $\mathrm{Si}(\mathrm{OH})_4$

Solution

$\mathrm{SiF}_4+4 \mathrm{H}_2 \mathrm{O} \longrightarrow \underset{\text { Silicic acid }}{\mathrm{Si}(\mathrm{OH})_4}+4 \mathrm{HCl}$ The trend towards hydrolysis decreases down the group. Silicon have vacant orbital to which water molecules can co-ordinate and hence their halides are hydrolysed by water.

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

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