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Standard XII
Chemistry
Question

In the following statements, select the correct statement :
  1. N(CH3)3 has pyramidal structure.
  2. N(SiH3)3 shows planar arrangement.
  3. SiC is highly volatile.
  4. SiO2 is called silane.

A
SiO2 is called silane.
B
N(CH3)3 has pyramidal structure.
C
N(SiH3)3 shows planar arrangement.
D
SiC is highly volatile.
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Q1
Assertion :N(CH3)3 is pyramidal but N(SiH3)3 is planar. Reason: In N(CH3)3, lone pair on N remains on it causing lp−bp repulsion while in N(SiH3)3, lone pair is transferred to vacant d-orbital of Si.
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Q2
N(CH3)3 and N(SiH3)3 both have sp3− hybridized N−atom and Pyramidal structure.

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Q3
Assertion :N(CH3)3 is pyramidal but N(SiH3)3 is planar. Reason: In N(SiH3)3 lone-pair on N−atom is transferred to the empty d− orbitals of silicon (pπ−dπ overlapping).
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Q4
The structure and hybridization of N(SiH3)3 respectively are:
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Q5
Structures of N(CH3)3 and N(SiH3)3 are different. It is due to the fact that :
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