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-p-Block elements - I — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
Which of the following attacks glass
  • A
    $HCl$
  • ✓
    $HF$
  • C
    $HI$
  • D
    $HBr$
✓

Answer

Correct option: B.
$HF$
b
(b) Glass being a mixture of sodium and calcium silicates reacts with hydrofluoric acid forming sodium and calcium fluorosilicates respectively.

$N{a_2}Si{O_3} + 3{H_2}{F_2} \to N{a_2}Si{F_4} + 3{H_2}O$

$CaSi{O_3} + 3{H_2}{F_2} \to CaSi{F_4} + 3{H_2}O$

The etching of glass is based on these reactions.
 

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