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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

When a fluoride is heated with concentration H 2 S O 4 in a glass tube and if a drop of water is held at the mouth of the glass tube, a white deposit formed is of

Options

  1. AH 2 S i F 6
  2. BS i O 2
  3. CH 2 S i O 3
  4. DS i F 4 + H 2 F 2

Correct answer

C. H 2 S i O 3

Step-by-step solution

C a F 2 + H 2 S O 4 c o n c . → C a S O 4 + H 2 F 2 S i O 2 + 2 H 2 F 2 → S i F 4 + 2 H 2 O 3SiF 4   +   3H 2 O   → H 2 SiO 3 Silicic   acid (Gelatinous   mass)   +     2H 2 SiF 6 (Hydrofluoro silicic acid)

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