Chemistry-
General
Easy

Question

Which of the following attacks glass

  1. HCl    
  2. HF    
  3. HI    
  4. HBr    

The correct answer is: HF


    Glass being a mixture of sodium and calcium silicates reacts with hydrofluoric acid forming sodium and calcium fluorosilicates respectively.
    N a subscript 2 end subscript S i O subscript 3 end subscript plus 3 H subscript 2 end subscript F subscript 2 end subscript rightwards arrow N a subscript 2 end subscript S i F subscript 4 end subscript plus 3 H subscript 2 end subscript O
    C a S i O subscript 3 end subscript plus 3 H subscript 2 end subscript F subscript 2 end subscript rightwards arrow C a S i F subscript 4 end subscript plus 3 H subscript 2 end subscript O
    The etching of glass is based on these reactions.

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