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. Only P and Q

  2. Only Q and R

  3. Only P and R

  4. All of these

  5. Only R
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is the correct answer. 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– 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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