Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The first underline is Si in P(SiH₃)₃, which has four σ bonds and a tetrahedral environment. N in N(SiH₃)₃ and N(GeH₃)₃ is planar. Underlined P in P(CH₃)₃ has three bonds and a lone pair, so is trigonal pyramidal. N in SiH₃NCS is not a three-coordinate trigonal pyramidal centre. O in H₃O⁺ has three bonds and a lone pair and qualifies. Count 2: P(CH₃)₃,H₃O⁺.