Multiple choice

Which of the following statements is/are not correct?

  1. Decaborane-14 has regular icosahedron geometry.
  2. Silicon does not form [SiCl6]2- and [SiF6]2-.
  3. n-Type semiconductors are made by the doping of Si atoms in Ga atoms.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
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A Correct answer
Explanation
  1. Decaborane-14 has ten boron atoms. This number is two short of being able to form a regular icosahedron geometry. Orthocarborane (B10C2H10R2) has 12 corners and 20 faces and has regular icosahedron geometry.
    1. [SiF6]2– is known whereas [SiCl6]2– is not. The main reasons are :(i) Six large chloride ions cannot be accommodated around Si4+ due to limitation of its size. (ii) Interaction between lone pair of chloride ion and Si4+ is not very strong.
    2. p-Type semiconductors are made by the doping of Si atoms in group 15 elements and n-Type semiconductors are made by the doping of Si atoms in group 13 elements.

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