Question

what is the hybridization state of si in sih4? select the single best answer.
○ sp²
○ sp³
○ sp³d²
○ sp³d

part 2 of 2
what is the hybridization state of si in h₃si - sih₃? select the single best answer.
○ sp³
○ sp³d
○ sp³d²
○ sp²

Explanation:

For $SiH_4$, silicon has 4 valence electrons and forms 4 sigma bonds with 4 hydrogen atoms. Using the VSEPR - based hybridization rule (number of electron - groups around the central atom), with 4 electron - groups (4 bonding pairs and 0 lone pairs), the hybridization is $sp^3$. For $H_3Si - SiH_3$, each silicon atom also forms 4 sigma bonds (3 with hydrogen and 1 with the other silicon atom), and has 0 lone pairs. So, the hybridization of each silicon atom is $sp^3$.

Answer:

For the first question: $sp^3$
For the second question: $sp^3$