Multiple choice

Which of the following statements are not correct?

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

  1. P and Q

  2. Q and R

  3. P and R

  4. All of these

  5. None of these
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A Correct answer
Explanation

P. 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. Q. [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. R. 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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